I need help with this, I am starting a larger tank for these two fish and two hermit crabs. I haven’t introduced anything new to this tank in a few months. There are two different things. On the rocks it looks like short worms. Then the white stringy stuff on the back. It’s also on the rocks but not stringy. I’m starting a new larger tank for the two clowns and two hermit crabs. I was about to put these rocks in the new tank and then I saw this. Anyone know what it is?