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Those look like sponges to me, so they probably won’t have any negative effects (rarely, people get invasive sponges that grow over and smother corals, but the vast majority of sponges are harmless/beneficial filter feeders - and the invasive ones typically become pretty obvious pretty quick).
Sponges? I am not very familiar with all the different types of sponges. These are sticking out of the rock work like needles and I see more and more of them each day.Those look like sponges to me, so they probably won’t have any negative effects (rarely, people get invasive sponges that grow over and smother corals, but the vast majority of sponges are harmless/beneficial filter feeders - and the invasive ones typically become pretty obvious pretty quick).
Yeah, some sponges grow that way - here are some links to threads with similar ones:Sponges? I am not very familiar with all the different types of sponges. These are sticking out of the rock work like needles and I see more and more of them each day.