Ive had a snowflake and I assume this one would do the same thing as mine. They can jump over a foot of air out of the tank, will eat all crabs except hermits, but overall will be a great addition. Doesnt bother fish, but Ive had my snowflake kill a copperband butterfly during a feeding frenzy. He didnt eat the fish, just bit it on accident and the fish died 2 days later. They wont attack fish, but they dont see well so any fish is a likely target. I do think mine was just more aggressive. Now last thing, make sure you close up all intakes!!!! mine went down the sump in a new tank set up along with another moray and tried to take a ride in the external return pump. Destroyed the pump, I think, my friend who was keeping my fish hasnt had time to check it out yet.