so im layin down lookin at my tank and i see what looks like cyno floating up from behind my hynophora but im like wait i got rid of all that stuff weeks ago. i look closer and i see half of my hydnophora is squirting out reddish brown stuff. its really freaky.
As long as you don't see the tissue receding it's fine. Probably it's "pooping". It's good you are keeping a close eye on your tank. Happy reefing!