they said it couldnt be done

Gee thats great , thanks for sharing and I feel sorry for your fish ...

2 days ........lol

Brendan said:

why would u feel sorry there not fighting anymore

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Because of the stress you are putting on them by haveing them together , Probably in a 55 or something too...
Plus As the Guideline reads .......REDS And BLACKS DONT MIX, I just dont get why its so hard to understand that , and Why everybody has to go against the grain all the time

Brendan said:

dont assume not good there in a 75 g actually thanks and alittle stress wont kill them, when u first by a fish they stress they get over it piranhas are pretty srtong fish, i think theyll be fine

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Dont asume ? Wow I was 20 gallons off
You got this in a 75

my black is a 7inch and the reds are 10inch 9 and 7,

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What a Joke ...
Yes they get over stress , but not when you have fish in there that do not get along with one another and the result is death .....

this is a Pointless argument ...

i guess will see a pointless argument indeed

I hate to jump on the bandwagon here in sayin this wont last long, but I really think it wont.

It's only been 2 days, your fish are still getting used to their surroundings. I had mixed pygos that went weeks before some decided the others dont belong there, I'm sure serras and pygos will turn out even worse, but I hope you prove us wrong.

If you have another tank, Id strongly suggest you move either the RBP's or the Rhom out, you dont want to loose the money and fish you put into this, do you?