Oscar for gt/firemouth?

  • We are currently upgrading MFK. thanks! -neo
About 4 inches
I think you've probably already accepted that the two oscars arent going to change course and should remain separated, so that's half the battle. I recently re-worked one of my 125 gal tanks around my tiger oscar. I only get single fish from any species to avoid direct competition (and/or mating aggression to rest of tank). All fish are generally less aggressive as species and smaller than than the O as well (but won't fit in his mouth).

One of those species was FM. I started with 3, and 2 proved to be quite aggressive (particularly to each other). I realized it quickly and returned those 2 to LFS for store credit. The FM were all about 3-4" to my Oscar's 10". Oscar never gave any of the FM a second glance. Different body shape and not a threat due to smaller size.

The GT will be a crap shoot. If they are similar size then its much less likely to work, and GT's seem to be either totally passive or quite aggressive.

Three cichlids I am currently keeping with that Oscar: 3.5" rainbow cichlid, 4.5" honduran red point, and a 3" blue acara (not the electric blue, very similar in appearance to a GT). Going very well thus far. You would have room to add any of these in your tank I would think, given appropriate hides etc.
 
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I suspect the GT that your friend wants to give you is really aggressive since he doesn't want an aggressive oscar in his tank. In a 107g, this could spell disaster for your tiger oscar or the new GT.
 
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I think I won‘t trade with my friend. Try to give away the red tiger and let the albino heal. Maybe after that, thinking about the suggestions of biguebs
In my next life i start with a 300 gallon to have less problems at the beginning?
 
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The last 2 months they did... sometimes little pushing but nothing special
Since monday the red tiger is bullying my albino... biting etc... albino was just hiding under driftwood most of the days... now red tiger is isolated in 50 gallon... think its the best to sell him like rocksor said and keep the friendly one
I have found that Oscar behavior can be tricky. An oscar that is picked on by another oscar is not necessarily a docile oscar. It could be. I have found that oscars do well in a non aggressive tank. An example - earth eaters.
Ultimately it can and up a trial of balancing types of fish but be ready to remove fish during the process.
 
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