Parasite or snails?

[Garrett Mackey]

Anybody have any idea what these are and if it is dangerous to add fish? I have set up the aquarium and had it running for a month or so with no fish and these have showed up in the meantime. Will I have to drain it before adding fish?

 

[saltyfilmfolks]

looks like harmless pineapple sponges

 

[KJ]

A+^^^^

 

[nanosteve]

3rd pineapple sponges. Interesting they are on your glass

 

[Garrett Mackey]

Thanks guys. There are a lot of them. Glad they are harmless