I got something...

[ScottieB]

Setup is like 7 months old, noticed these all over the pumps, the sump, the overflow. Hopefully harmless... I’m thinking sponge? Your input would be much appreciated.
Thanks in advance.

 

[ludnix]

I think your correct that it's a harmless sponge, maybe pineapple sponges?

 

[ScottieB]

Did a quick R2R search and yes Pinapple Sponge is probably it. Thanks!
Appreciate your help