White spider web thing?

Helms Reef

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I saw this on the live rock but I found it on my pump. What is this? Good/bad?

D5D83BA5-2132-4138-9A01-62290D71BC48.jpeg
 

Goaway

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I want to say white lace sponge. I would actually remove it. But, that's me. I don't know if it would cause issues. I believe it could lower flow, depending on how it grows.

Usually I keep sponges, until they grow on places I don't want them.

Edit : good or bad is based on you. Sponges can compete for food and trace elements coral need. Honestly, I never seen a growth issue. Only with bad lights.
 

BaghdadBean

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Is it hard and calcareous to touch? If so, you may have a vermetid snail outbreak. I know, they don’t look like snail snails, more like tube worms, but they’re a huge PIA to get rid of. I had a bunch ruin some internal pumps before.
 
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