Help with Clam

[Mango_Fish]

Hi everyone, i’ve been noticing on my clam part of the mantle is not coming out completely for the last couple months and along the mantle. There’s like a sponge growing all around the mantle. I don’t know if these are problems for the clam. I just wanted to see if there’s any way I could fix with the mantle not being out completely or anything that would help thanks, matt

[ParrotFish]

I'd scrub that sponge off. It may be just irritating enough to cause it to not fully extend.