Got up this morning to find my elephant nose has four splits on his top fin, don't know what has happened they're clean splits not fin rot. He's in a 50 gallon with eight kuhli, a bnp and bulldog plec and inverts. Im baffled to how this has happened. 0 ammonia 0 nitrite 5 nitrate. Do you guys have an idea or a culprit. Any help would be appreciated.