sponge?

Any odea what this fleshy looking purple thing is on my rock? It does not move, had an indention/hole in the middle and looks porous. Could this be a sponge?

In person it looks like a white blob with little spiky looking extrusions. assuming its a sponge? I've noticed it not filling out as much as usual. TIA!!

It doesn’t look like cyano, it doesn’t come off when i rub it vigorously it feels kind of soft like a sponge.

Does anyone know what this yellow is? There’s also a wired mussel looking thing lol

Ive only just noticed it today, the tank is only a couple months old. Please help identify, after browsing the web i still haven’t found anything like it haha, It’s only around an inch big and it looks like it has pores

Hey guys, Anyone knows what this is?

So I thought this was hard but it turns out it’s not not hard so i’m guessing sponge? What kind is this??? It just started growing in my tank randomly and I have no idea what it is