I'm sure there's quite a bit of variability with these guys in terms of what they will and will not eat. He seems willing to taste everything, so there's probably individuals out there that could be a problem.
In the wild they blow jets of water on the substrate to uncover crustaceans and worms. He won't do it at all for like a month, then in a week he'll practically resurface my sand bed. When he's in one of his sand hunting moods, the water in the tank looks like I've just vacuumed the sand for days at a time. It's his only other annoying habit, but it can also be mitigated by just feeding him more.
They are never not hungry, and their poop can be as long as they are.
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