Help with brown hair alage

[Janet13]

Have a 2 month old 120 gallon tank with live rock and 4 corals with a few turbo snails and hermit crabs up until a week ago the snails and hermits were keeping brown hair alage in check. Then it bloomed all over the back and on rocks up to an inch or two long. Water chemistry is zero ammonia, nitrate, nitrite and phosphate, calcium 450, magnesium 1500. 20% water changes every two weeks, ro water, refugium with mud and chaeto, gfo and carbon set up. It is taking over tank. Looking at other posts lots of different options couldn’t figure out best options. Any suggestions.

 

[tdileo]

Following along since I’m having a bit of a similar problem. I have a short brown hair algae popping up everywhere in my 2 month old system and it never happened on my other tank.