Bryopsis

[lazylivin]

If it is spreading fast it is likely hair algae. Marine Algae Fix works good on it. Just remove any macro algae if you use it. Phosphate removal media is great to use all the time to maintain the tank so good call there.

[ReeferMadness]

right, I know better to treat the problem than cover it up, it just takes a while for my common sense to click in )

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[Twizted1]

Have to tried pulling any of it out? If so was it soft and slimy? Or is it kind of hard?

[ReeferMadness]

It's harder than shit to pull off the rocks, I had to use a wire brush but it's soft and a little slimy

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[Twizted1]

Sounds like gha to me too. When it gets long it gets tattered in the current. You can pull some off, but it won't actually come off the rock. The first thing to do is start working your skimmer as hard as you can. Reduce feeding. Run gfo or some other PO4 remover. This will take time and patients. But you can beat it. I did.

[ReeferMadness]

Sounds like gha to me too. When it gets long it gets tattered in the current. You can pull some off, but it won't actually come off the rock. The first thing to do is start working your skimmer as hard as you can. Reduce feeding. Run gfo or some other PO4 remover. This will take time and patients. But you can beat it. I did.

thanks, I need to start a whole new thread for the best settings for my skimmer.   

[chromiumlux]

That second pic is without a doubt bryopsis. Looks like plumosa. If this has established a root system it will be hard to kill. I would check every inch of the system. The problem with this algae is if you pull it manually you will....and I repeat will spread it. This algae is spore driven and can reproduce from the tiniest little piece. IMHO, I would pull the rock and nuke it. Make sure it's not in the sand also. I fought this crap for three years and finally won the battle. Good luck with whatever route you take.

[mdog3000]

I fought that for years. Hydrogen peroxide did nothing for me. I would just have to manually clean every rock with a tooth brush at least once a week. I would follow the previous suggestions and bleach the rocks.