I've just bought a yellow clown goby/yellow rock goby and made my first big reef keeping mistake. firstly i didnt choose exectly which goby i wanted and secondly didnt inspect him properly i was im a distracted. i brought him home and added him to the tank and when looking closer at home noticed he has tatty fins are these just nips from other fish? will they grow back? if so how long? what health issues should i look for? im new at reef keeping so please go easy, please help thanks.