discuss the discus

Just post a pic of all these things in your tank so we can stop geussing.

 

with white circular things that come out and hide when you touch it

yo small to get a clear pic of it

 

This is souding more like a marine tank. The only things that should be alive in your tank should be fish or snails.

 

ya the same thing found in mature marine sumps

 

Sounds like hydra.

LINK.