Reefer's Dreams

For the last week or so, I have had a hufe algea bloom. The first kind of algea was red slime algea, which was solved with a red slmie algea remover. I used the product and it was completely gone within 2 days. After that algea was gone, green hair algea started to appear in my tank and has almost completely covered everything in a very fine hair of green algea, even my coral has some on it. I have talked to the LFS about it, and they say to use a phosphate remover and a nitrate remover as that is what it uses to spread, as well as doing frequent water changes with R/O water, but im not sure I want to use that cuz that could get a bit expensive.