Make sure all your rock is stable they are very strong and can topple rocks when digging I had one in my 50 gallon reef he was 16 inches my clarkii clowns actually style did from his mouth best to feed after light is out so no, one gets in his way they love ghost shrimp and squid if ur buying squid from grocery store ask for guts left in its the protein the odd piece of shrimp will be taken... I hand fed my eel ppl say not to bc there teeth do damage anymore questions msg me.. Oh and they can stop eating for a few weeks its regular for snow flakes