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I just got a 75 gallon, how many red bellies can I put in it? I was thinking 6 or 7, oh yeah Mindy dont answer this. I dont want to hear your crap about 20 gallons per fish.
 

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The ASSMAN
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I would go with 5, I had 6 pygos in a 75 and it felt crowded and they were only 5-7 inches. I now have 7 in a 125 and it seems better. I dont agree with 20 gallons a p but they need enough room get away from aggression or to just have some "alone time".
 

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1 natt per 20 gallons

by using this rule you shouldnt run into any crowding problems
 

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If your planning on 6-7 you can do it. But when they start getting bigger they wouldn't have that much room but its been before.
 

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Hmmmm.....my tendency would be to go with 6 or 7 but I dont want to get shot over this thread....

My final answer: 5

:rockin:
 

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The "20 gallon" rule (more correctly, guide) is a good starting point for figuring out how many fish you can keep. After about 60 gallons though it becomes less accurate. In a 75 you could hold 5-6 and be relatively confident they will not crowd each other. Especially if you get them as juvis. It might not be a bad idea to provide plenty of cover, it will make them feel much safer and help reduce stress.
 

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it actualy all depends on how wide your tank is if you get right down to it

when one piranha has to dodge a bite or nip from from another piranha the extra widness in a tank comes into play tramendiously
 

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Ba20 said:
it actualy all depends on how wide your tank is if you get right down to it

when one piranha has to dodge a bite or nip from from another piranha the extra widness in a tank comes into play tramendiously
Also depends on length. Height doesn't really help that much in terms of adding more fish.
 

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Don't forget the depth (front/back). Tanks with a more square footprint are more ideal for piranhas, they prefer to roam around near the bottom instead of up/down. So two tanks with identical footprints but one is larger, the larger one is a waste of money. Good point.
 

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"front to back" is width
but yes you are right about the bigger foot print
 

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say your standing in front of the tank

left to right - length
front to back - width
bottom to top - height
 
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