Still looking for advice on this! Even the little brown one got a toe/foot of one of the green ones at feeding time last night. They are now in a 20-long aquarium that is still about 1/2 water, 1/2 land. Also, any comments on the setup would be appreciated. The water part has java moss in it and is about 1 1/2 to 2 inches at the deepest; a waterfall area at the left, otherwise used large gravel plus sheet and frog moss covering most of the gravel for the upper land part. The waterfall area is really a reptofilter at the back left, then I built up the area beneath the water output area with a hideout thing, slate and rocks on top and around it.