What .. these guys are pretty hardy...ish.. have to go thru the usual questions .. how long was tank set up , what where the water readings , PH ,ammonia , nitrite ,nitrate , temp , filters etc , any chemicals been in the tank before hand ( these guys don't have scales .. so easy for them to react to these conditions) .. but in saying that if the tank is mature you shouldn't have a prob , unless someone in the tank didn't like it encroaching in it's territory( caves etc) ... anyway thats from my own experience with them .. others will have their views so read all that comes your way and good luck next time...