I have this thin brown stuff killing my zoas. It's driven them right off the frag plug. Had them 6 months, they were doing great. I tried blowing water over them with a turkey battery and it wouldn't budge. Used aiptasia-x on a little aiptasia that also started growing in the middle and it melted off the brown stuff (some of it) too.
Any ID? Never seen it before.
Any ID? Never seen it before.