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It's always a yellow/brownish color. never green like the pics I seen for Ulva.Possibly extremely unhealthy ulva. I’m really not sure though, that looks weird for sure.
it was late at night and the lights have been off.I actually bought this algae before, never got to go around to id it, but it doesn’t root to rocks. Manual removal should be easy. Your LPS seem a bit unhappy though are they always closed?
Thanks for the reply but i dont have any sponges in the tank.it almost looks like a dying sponge colony.