joes juice should do it, same for aptasia x. you just have to turn off all the powerheads and pumps and let it sit on the polyps for 5-6 minutes.
if you have some kalkwasser powder you could make a paste and spread it on them, letting it sit for a while. but I've found that you may end up killing wanted stuff if you don't try and syphon off as much as the paste as you can before turning the pumps back on.