still kinda hard to see, but I'd recommend using some kalk paste. Make a super thick mixture of kalk and ro/di, almost like toothpaste consistency. Turn your flow off, put the kalk on a gloved hand (or use a dropper or something else since it's such tight quarters), paste it all over that area, and you should be set. Turn the flow back on in 5-10 minutes, and it won't bother the coral much.
If you get it on the coral, it could hurt the coral, but it'll come back.
If you get it on the coral, it could hurt the coral, but it'll come back.
