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Can someone please help ID somethin that is growing on my LR? I know that my pictures aren't the best but hopefully it will be enough for you to have some sort of idea. Thanks for your consideration!
Looks like it could be the starts of some macro algae but it's covered in die off? How old is the rock? It's possible it may be a sponge as well. Sorry I can't be more specific.
Thank you fluff for your help. Assuming that it's sponge, what course of action should I take, if any? The piece of LR is about 6 months old, I got it from Liverocks.com
Well, if you find it unsightly, remove it. I'd just let it go for now though and see what becomes of it. I've seen branching sponges that resemble what you have, but only in low lite tanks or growing behind and under the rocks away from the light.