Hey all, im having an issue with some corals bleaching the one that are being effected are 4 corals as of now, the corals are as followed, Pink Stylophora, Yellow Porties, Pink Setosa, and a large colony of Blue Stag. the corals are bleaching from the bottom of the coral and working upwards. i have been having some lighting issues and finaly got that fixed on Monday, all my levels are in check and checked for flat worms and coral eating starfish but haven't seen either. i do have starfish but almost never see them on corals. its odd to me that the elkhorn type sps and the stag are the only infected. i have much more finicky corals that are doing ok. like lokie, purple monster, organ tort, and my big colony of tri color valeda pearlberry and skittles. i have been dosing algaefix for a couple week to kill a hair algae problem that seem to have started. but is under control for the most part. i also recently noticed some cyano and dosed red slim remover to combat that issue. really the lighting has been the biggest issue or all. i wouldn't imagine that they would bleach from the bottom on a lighting issue unless very stressed but why just the corals mentioned i would think it would be all of them. i have heard about white ring disease, and white plague but cant find anywhere where this has been reported in a aquarium type system so im kinda counting that out.
thanks Matt