Weird mine loved nori , would hit its spikes with it and then it would grab using spikes. Also eat any type of algae , leftover meat on occasion , soft coral , macro algae including caulerpa
I definitely know they’ll eat black pond foam. They might not digest it but they’ll poop it out. Side note it was pretty interesting to see poop float and to find sand grain size pieces of black foam in your soak filters.
