09-23-2013, 07:07 PM
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My guess is, your RTS was already "putting up with" enough in a 75 gallon tank with a pleco in its turf, (bottom feeding). Then you added red-finned fellow cyprinids, that he's not famous for getting along with without LOTS of room & excessive cover. If you seriously densely planted that tank, you might get him back in there without trouble, but it would be a lot easier in a 150 gallon, or better. I dearly love Red Tailed Sharks, but they're best kept in a Monster tank, if you want them in a large community.