I agree with this 100%. It sure looks like Bryopsis from the pic and this is evil stuff. It was the cause for me to close down my tank years ago. I tried black outs for a week at a time, scrubbing the rocks, water changes like crazy! The tank would look better for a few days and the stuff would continue to pop up everywhere from seams in the corners of the tank to just about anything. This went on for 6 months before I gave up.Bryopsis is not just a regular hair algae. It's an infestation. You'll spend alot more then the $20 bucks you spent on the mushroom rock trying to get rid of your bryopsis. Not to mention the time and headaches. Bryopsis with smother your corals as well. Is takes no prisoners. You can take your chances and throw it in the sump, but bryopsis will release spores especially when it's stressed ie, no light source.
Ok...so I'm in trouble. This stuff has already wiped out my star polyp colony...it's spreading through my tank. I've already started the water changes and they're helping but what else can I do?Chemi clean is for cyano not for bryopsis. It also works with Dino a bit but not fully
Are those the pieces that I brought to the frag swap that you got stuck with? My apologies if so, but you could have tossed them...Really what's worse to have in your tank, hair algae or a kenya tree. I've had one piece of Kenya tree in my tank that someone left (without me knowing) and to this day I still have sprouts growing in atleast 8 different areas!!!!
Thanks for the info, I'll look for a phosphate remover tomorrow. Good luck OP, seeing how it took out a large green star polyp colony I'd suggest you toss the rock or put it into a QT for the time being. The stuff overtakes a tank like crazy.+1 for keeping phosphate low as well, but this stuff absorbs phosphate and tricks you to think it's low.
I ran rowa phos as well but thinking back maybe not enough and I didn't change it often enough. Just some thoughts for you.