Friend is rehoming convicts, can I make it work?
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Oscar, really? I've always been told never to mix oscars... then again I've been told a lot of weird things...
A pair of cons would most likely terrorize anything in a 90g. Ive had pairs take over 55-265g tanks from fish 6+ times their size. Id go with Als idea (gruffmaster) of all males.
Notice he said "a single oscar". a 90g is almost bare minimum for an oscar to have a healthy thriving habitat...so if you get him a little bigger than a few male cons he should be good to go.
So when you say a few, is it safe to get more than 2 if they're all males? Or should I keep it to two if I'm mixing other species in the tank?
Sorry to derail a bit, but I was just wondering what the science department your friend is working for is using the convicts for? Just curious. 
They're lab pets. They started out with 4 of them and they just kept breeding and breeding and they can't keep setting up more tanks to house all the little buggers, it's taking away from their real work lol
Too funny. Sounds like they need to separate the main male and female breeders or something. They will have an army of convicts soon enough. If there was some comic book lab accident and convicts sprouted legs, grew lungs, and became dog-sized, I'm pretty sure they would cause the extinction of the human race. 
That is how it is with cichlid espicially agressive ones. Hard to keep them together without something getting beaten up. That is why I now keep geophagus cichlids. If anything I would do all male convicts but as was said they have been known to run 265 gallons.
If you do not want them then don't take them. If you want to set the tank up again then do it with fish you really want. It is not like convicts is a rare fish in demand. You can get them anywhere so what are you passing up. Nothing!
