I think my mel is afraid of the (what I 99.9% suspect) fireworms in my tank, lol. (In his defense, they're way bigger than his mouth and they have some nasty bristles that are like needles). Instead of doing his pest-irradication job, he ignores them and spends his time flipping over and unaliving snails.I would rather have lots'o little ones doing their job in keeping the tank clean.
If they are too big for the melanurus to punish it for exposing itself, I get the snake tongs out...