Neptune Aquatics

What is this ???

L/B Block

Supporting Member
Ok folks-doing some maintenance today after I just got home and I saw this around my return pump. Or rather under it. I am unclear what it could be.

Any input greatly appreciated.

L & B

CBC51B56-774F-468F-B070-10BCCB80CA53.jpeg
 
pineapple sponges on the bottom glass... under the pump is another sponge. which kind, i dont know, maybe tunicate ??? either way, harmless filter feeders.
 
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