I have 3 Caribe about 6.5-7.5" and I decided to get three more reds to put in this tank. I know it's a small tank but I wanted to try anyways after doing some reading. The reds were supposed to be in the 7 inch range but when I measured TL the biggest was 5.5" of the three. What I did was take out all the decor in the tank so it's just a bare tank and to lessen the territories of the Caribe but that didn't seem to work cause they seem to hang out in the same places of the tank anyways. All the reds hang out on the right hand side of the tank and they seem to be "bunched" up there. What I want is for them all to swim around the whole tank but the Caribe seem to be so territorial. Do you think if I add a strong powerhead I might get this where they swim around the tank instead of hang around in there own place in the tank. I already have a 402 but they don't even act like it's there. BTW I'm soon to get a bigger tank for these guys at least a 125, possibly a 180. Also I have a 4" Piraya that's supposed to be on it's way but I might just put it in it's own tank.