Are these spots feather dusters or…?

[TanknTang]

Hey guys any ideas if these blobs are feather dusters or something else? When I hit them with my scraper it appeared like it retracted.

Almost looks like fuzzy jelly. Hard to describe but appear white/translucent. They reside on the live rock that is always shaded.

 

[Mark Goode]

I don't think the pictures are clear enough. Fuzzy jelly? Sounds like sponge to me, but that's only a guess.

 

[TanknTang]

I don't think the pictures are clear enough. Fuzzy jelly? Sounds like sponge to me, but that's only a guess.

I can try to get better photos maybe rendering them zoomed in

 

[Gumbies R Us]

They look more like sponges to me

 

[TanknTang]

They look more like sponges to me

Are sponges bad to have either? I am not sure how to test what these things are

 

[Mark Goode]

Are sponges bad to have either? I am not sure how to test what these things are

Sponges are harmless filter feeders. At least I'm not aware of any that cause problems.

 

[Ron Reefman]

Sponges are OK. Most of the ones that will survive in an aquarium will grow in very low light or under rocks. The pretty sponges that grow on reefs in the light are nearly impossible to keep in an aquarium (with just a VERY few exceptions.

There are some very small feather dusters that often show up in our tanks. They are also harmless and can be a short lived (as in months) phase in the tank.

Better photos would be a big help to ID what you have here.