I have 4 fl ocell/mono. They have always swam around together and got along just fine. All 4 of them usto hang out inside a clay pot together, but now one has become agressive and pushes out the other fish. To me seems that one of the other fish mighting be pairing with that one, but its dificult for me to tell my fish appart so I dont know if its the same one in the pot with him every time. It is constantly pushing the other fish out but often is ok with one fish being in there. Also the fish is always moving out the gravel from inside the pot, the fish fills its mouth with gravel and then spit it out outside. It is fun to watch. Is it possible that they are pairing or am I imagining things? or are they just crowed? at what size do they start pairing up?