sponge identification

The ATO in my nano overflowed the tank, and this is why: Can I feed this stuff to my watanabe angel in my 90g by including it in the frozen fish food mix i make with a food processor? If so, do I need to rinse it or clean it somehow before adding it?

Hey guys! I woke up this morning to a white sponge growing under our torch coral and I was wondering if it was harmful and should be removed :)I've attached a photo. Thankyou in advance!

I have noticed a purple sponge-like mass growing at the top of my mixed reef tank. In the last 6 months it seems to have accelerated in size and a second growth has appeared in recent weeks. Should I be concerned that it’s taking nutrients from my corals? If so, what are the best ways to remove...