i've got the same issue the last time i had the hammer coral. Its the brown jelly disease.
Try dipping it in iodine solution every day and have high flow.. (doesn't work for me) i cut mine off in the end cos these things spread.
u can try using two nets? but the last time i tried to catch one, i have to remove most of my liverocks..heh
bro, u r using sand substrate? how do u manage to keep it so clean?
yea, so true. mushrooms and zoas will probably be happy with a fan or two.
true octo, torch, open brain, flower pots, bubbles need lower temperature IMO.