cowrie

I have a tiger cowrie (his name is Howard) and was wondering if he could eat a blue photosynthetic plating sponge. I read they eat sponges, but the plating sponges contain the hard glassy material ( forgot what it was called.) Could it work?

A friend of mine today gave me a large cowrie snail, asking me to clean it out for her to use as a shell. I told her I would, but I’m not gonna go and hurt a creature like that so instead I put it in my tank at home. Once I got home, I put it in and I did see it move a bit, but I’m afraid it was...