Hi, I have only just managed to set my tank up last week (the delivery guy dropped the first one on me
). And i have a Eel Tail Catfish first that started wacking its side against the bottom on the gravel quite regularly, and now one of the Cichlids has also started wacking its side on the bottom but only on sea shells that are in the bottom of the tank. Does anyone know what is causing this behaviour? Should i Be worried?? Seperate them from the others??? Anyone with knowledge about this please respond.