Hi there, I have kept Seahorses But never corals until recently. My first acquisition was this little guy who was doing well until this morning. A spider web like substance has been produced that covers one polyp like a sock, it swipes away with a water puff and a gentle swipe, but this can’t be good. I see no sign of bugs or pox.. tank parameters are normal range, no big changes. No fish, just blue leg hermits and snails. This is a 5 gal nano- water change 5 days ago. Anyone know what I should try ? Thanks for looking !