Hi there, we have 2 snowflake eels in a 200 gal, so far so good, one is 22-24in and the other is about the size of a pencil. The baby one was going into our 72gal. but we couldn't find him when we putour big one in, we thought he went into the over flow again, when we checked he was not in there, at feeding time he popped his head out of the sand, I've tried to catch him but it always turns into a disaster, so for now he stays. Now, I'm not by NO means saying this is going to work, I'm simply saying as of yet we haven't had a problem. Please becareful with whatever you choose to do. Lisa