With regards to dipping corals in RO, I didn't realise that was a no no. I thought it was just another way to get rid of other types of possible pests. Would an RO dip affect all corals or just some? And what affects would it have on the coral?You wont get AEFW on that. Its not a acro. Also i wouldnt be RO dipping corals. Unless its spreading I think its just from being shaded