I have noticed over the last few weeks my zoa colonies have not been opening fully. I keep loads of other soft corals and nothing else seems affected. Established tank so no amm or nitrites present, nitrate .05 weekly 20% PWC
. I have, however noticed that my scooter blenny spends most of his day climbing all over them, causing them to retract. Can this cause long term effects on the zoas? Has anyone else had a dragonet that does this? They are considered reef safe but I suppose that means they don't eat corals?