I can’t say I’ve seen mine munching on silicon before. Even as a baby it prefers wood, rocks or the glass when it’s not eating food I’ve given it.
Do you have any wood in the tank? If not, maybe that would make a good distraction for it.
yep I have wood in there and he likes that, but occasionally he chews on the silicon. Well, he's starting to slow down and become more interested in his surroundings, so I think it's better.