Well I made the first move today. Moved a bunch of fish into the 125 and then added the geo bra. So far so good they dont even look at each other. In the tank is a female lyonsi 4-5", geo bra 4-5", 7 geo tapoajos 4-5", 5 bosemani rainbows 2-3", female rtm 3", v. bifa 3", v. syn 3". This in preperation for my 300tall.