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Exodon Paradoxus - General Info Stocking Ratio Rate Topic: -----

Posted 05 September 2014 - 11:08 PM (#1) User is offline   Quad 

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Hey all, It's been a long time since I've been on P-fury, and it seems like its been a long time since most people have been on P-fury. I have been keeping Exodons for the past couple of years, and it still seems like there is still little information out there about these fish. The things that I have learned about these fish over the past couple years is -stocking ratio, filtration needs, signs of stress (or not eating).
So, I thought I would provide what I've learned in hopes that it helps others.

Stocking Ratio:
Of course all of the information out there says minimum of 8 to 12 Exodons, and some provide a minimum aquarium size, but no website would correlate how many Exodons you could have for a specific aquarium size. Of course Exodons are not like your typical fish, and many say they need to be over-stocked (compared to the old 1" of fish per gallon rule) without any guidance. So, I surveyed the internet, including forums and youtube, and anywhere I could find where Exodon owners would list their current stock and their aquarium size and did some bench marking. I took all of this data, calculated the gallon/fish ratio, fit it to a normal distribution, and calculated the standard deviation. Here's what I found:
The average (and therefore most successful) stocking ratio is 3.00 gallons / Exodon with a minimum of about 10 Exodons, which means the minimum aquarium size is 30 gallons.
+1 Standard Deviation (Understocked): 7.58 gallon/exodon.
-1 Standard Deviation (Overstocked): 1.87 gallon/exodon
Most extreme cases I found from my survey:
Understocked: 11 Exodons in a 118 gallon tank (10.7 gallon/ exodon)
Overstocked: 90 Exodons in a 90 gallon (1.0 gallon/exodon)

I went through all of this trouble because one day my exodons just stopped eating, and it wasn't until I solved a couple issues that they went back to their normal aggressive selves. Due to the wide range of stocking levels and misleading info I've found online on exodons, I had thought that my tank setup was perfectly fine. After I did this analysis, I realized how overstocked my tank was.
My previous tank setup was a 29 gallon with 17 exodons (1.7 gallon/exodon). I had 20 initially, but aggression and overstocking changed that. Due to my tank being overstocked, my fish stopped eating well, and instead focused their aggression on attacking the smallest fish in the school. Once I found that my tank was nearly 1 standard deviation away from the norm (that's about 68% above average stocking levels for those that don't use standard deviations much) I realized that a change in my stocking levels would probably help. So I upgraded my aquarium to a 55 gallon which put me marginally understocked at 3.2 gallon/exodon. I knew when I went to a larger tank size, I would also need a better filter, which I believe my previous setup didn't have sufficient filtration as well.

Most websites will recommend somewhere between 3x to 10x GPH required (example: a 10 gallon aquarium would need enough filtration to produce 30gph to 100 gph). Again, since the recommendation varied so much, I sought additional information. I focused on recommendations for planted tanks, since my tank is planted, and it seems that the average recommendation for a planted tank is about 5x-6x GPH.
However, I found an extremely useful tool online, that allowed me simulate and try out various filters until I found one that met all of my aquariums filtration needs, for my specific stocking level and aquarium size/shape. I'd suggest you check it out:
http://aqadvisor.com/
I ended up getting an Eheim Classic 2217 (264 GPH) to go with my Eheim Ecco 2232 (127 GPH) for a total of 391 GPH, which on a 55 gallon is about 7x GPH. The water parameters are much better now, and that in combination with the larger aquarium size has caused my exodons to be less stressed. They are now eating very well, and are back to their usual aggressive selves.

Sorry for the long post, but hopefully this info helps other exodon owners out there.
Attached File  DSC_0046.JPG (9.9MB)
Number of downloads: 13

This post has been edited by Quad: 05 September 2014 - 11:12 PM

55 gallon planted aquarium
17 Exodons
3 Cory catfish

Filtration: Eheim Classic 2217 & Eheim Ecco 2232

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Posted 06 September 2014 - 06:24 PM (#2) User is offline   scent troll 

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:bowdown:
awesome post man! very informative. exodons have always been one of the most interesting fish to me. truly amazing little fish.
i can tell you have a lot of passion for them. your tank looks fantastic.

good stuff man
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Posted 20 September 2014 - 05:30 PM (#3) User is offline   bernokarl 

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Very Nice Tank !
NO PIRANHA AT CURRENT TIME > .

Posted 21 September 2014 - 03:36 AM (#4) User is offline   Piranha_man 

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Ya man, your tank does look awesome.
I love the science you provided as well... you obviously put a lot of work/thought into it.

The only thing i'd say in argument would be the "planted tanks require 5x - 6x filtration, well of course, that depends on factors such as:

1.) Species of fish kept.
2.) Size of fish kept.
3.) Number of fish kept.
4.) Type/quality of filtration provided.
5.) Frequency/percentage of water changes.


Your tank looks so cool, you have inspired me to consider getting exodons again.
I've been thinking about setting an aquarium up in my lab at work... exodons would be perfect. :thumbsup:
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Posted 16 December 2014 - 04:36 PM (#5) User is offline   scent troll 

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always had a thing for exodons. never actually owned any though. theyre just too small of fish for my interest and i never felt like investing in a shoal of 10+ when most stores around me sell them at $15 a fish :blink:
theyre like the coolest tetras ive ever seen lol...but that being said ill stick with my tank busters.
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Posted 21 December 2014 - 07:45 AM (#6) User is offline   Colty 

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Great looking Tank .....:bowdown:

Posted 18 April 2015 - 05:00 PM (#7) User is offline   Ariana_Grande 

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I like that they shoal. what can you keep with them

Posted 27 November 2015 - 10:29 PM (#8) User is offline   nightwolf 

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so 75 gallon can have 20 of them right? and by the way ur tank looks great

Posted 07 July 2016 - 07:37 AM (#9) User is offline   Earled 

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Sweet looking tank. I have a 90 Exodon planted tank. Super cool fish

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This post has been edited by Earled: 07 July 2016 - 07:52 AM


Posted 07 July 2016 - 07:54 AM (#10) User is offline   Earled 

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View PostAriana_Grande, on 18 April 2015 - 05:00 PM, said:

I like that they shoal. what can you keep with them



You have to go with scaleless fish. Loaches, Plecos and cats.

I have 4 Pakistani loaches and baby albino bn Plecos

Posted 23 August 2017 - 09:41 AM (#11) User is offline   ChompChomp86 

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I just picked up a shoal of Exodons!

Ill try and get some pics/video up here soon. They are still settling in. These guys are about an inch and a half right now so still juveniles in the grand scheme of things I assume? When do they usually start getting their redish/orange hue on the body and fins?

Posted 26 August 2017 - 12:59 PM (#12) User is offline   Piranha_man 

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Turns out you indeed inspired me to get some exodons, shortly after my last post in this thread I ordered 50 of the little bastards, it's whittled itself down to 35 awesome specimens. :thumbsup:

This post has been edited by Piranha_man: 26 August 2017 - 01:00 PM

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Posted 12 December 2017 - 10:36 AM (#13) User is offline   Azqueta14 

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View PostQuad, on 05 September 2014 - 11:08 PM, said:

Hey all, It's been a long time since I've been on P-fury, and it seems like its been a long time since most people have been on P-fury. I have been keeping Exodons for the past couple of years, and it still seems like there is still little information out there about these fish. The things that I have learned about these fish over the past couple years is -stocking ratio, filtration needs, signs of stress (or not eating).
So, I thought I would provide what I've learned in hopes that it helps others.

Stocking Ratio:
Of course all of the information out there says minimum of 8 to 12 Exodons, and some provide a minimum aquarium size, but no website would correlate how many Exodons you could have for a specific aquarium size. Of course Exodons are not like your typical fish, and many say they need to be over-stocked (compared to the old 1" of fish per gallon rule) without any guidance. So, I surveyed the internet, including forums and youtube, and anywhere I could find where Exodon owners would list their current stock and their aquarium size and did some bench marking. I took all of this data, calculated the gallon/fish ratio, fit it to a normal distribution, and calculated the standard deviation. Here's what I found:
The average (and therefore most successful) stocking ratio is 3.00 gallons / Exodon with a minimum of about 10 Exodons, which means the minimum aquarium size is 30 gallons.
+1 Standard Deviation (Understocked): 7.58 gallon/exodon.
-1 Standard Deviation (Overstocked): 1.87 gallon/exodon
Most extreme cases I found from my survey:
Understocked: 11 Exodons in a 118 gallon tank (10.7 gallon/ exodon)
Overstocked: 90 Exodons in a 90 gallon (1.0 gallon/exodon)

I went through all of this trouble because one day my exodons just stopped eating, and it wasn't until I solved a couple issues that they went back to their normal aggressive selves. Due to the wide range of stocking levels and misleading info I've found online on exodons, I had thought that my tank setup was perfectly fine. After I did this analysis, I realized how overstocked my tank was.
My previous tank setup was a 29 gallon with 17 exodons (1.7 gallon/exodon). I had 20 initially, but aggression and overstocking changed that. Due to my tank being overstocked, my fish stopped eating well, and instead focused their aggression on attacking the smallest fish in the school. Once I found that my tank was nearly 1 standard deviation away from the norm (that's about 68% above average stocking levels for those that don't use standard deviations much) I realized that a change in my stocking levels would probably help. So I upgraded my aquarium to a 55 gallon which put me marginally understocked at 3.2 gallon/exodon. I knew when I went to a larger tank size, I would also need a better filter, which I believe my previous setup didn't have sufficient filtration as well.

Most websites will recommend somewhere between 3x to 10x GPH required (example: a 10 gallon aquarium would need enough filtration to produce 30gph to 100 gph). Again, since the recommendation varied so much, I sought additional information. I focused on recommendations for planted tanks, since my tank is planted, and it seems that the average recommendation for a planted tank is about 5x-6x GPH.
However, I found an extremely useful tool online, that allowed me simulate and try out various filters until I found one that met all of my aquariums filtration needs, for my specific stocking level and aquarium size/shape. I'd suggest you check it out:
http://aqadvisor.com/
I ended up getting an Eheim Classic 2217 (264 GPH) to go with my Eheim Ecco 2232 (127 GPH) for a total of 391 GPH, which on a 55 gallon is about 7x GPH. The water parameters are much better now, and that in combination with the larger aquarium size has caused my exodons to be less stressed. They are now eating very well, and are back to their usual aggressive selves.

Sorry for the long post, but hopefully this info helps other exodon owners out there.
Attachment DSC_0046.JPG
what is ratio for males to females or should u do just males or just females?

Thank you

Posted 12 December 2017 - 10:42 AM (#14) User is offline   Azqueta14 

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What is the stock ratio to male to female, is there one, and should u do a single gende?

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