I used to have them in a 20 Gallon bucket but I had to move recently. There are 5 2 females 3 males seems like the biggest female is aggressive too but she is too big to catch the others. I also have 4 Cherry shrimp too the fish never bother them tho. I had a ceramic hide a log 2 banana plants and a filter. When I noticed it I ordered guppy grass thought it might help. Should I wait to put the really aggressive male back in with the plants?