Need Help

[dirtyreefer]

4 words: GET A GOOD SKIMMER!!

I had the exact same problem, did water changes every day and the stuff would grow back on my substrate and glass in hours.

I was using a crappy prizm skimmer beforehand, but I upgraded to a remora pro. You will be able to tell by all the crap you pull out of your tank, that is the nutrients that's feeding your cyano.

Trust me on this one, don't cheap out on a skimmer because to me it's the most important instrument to keeping a successful tank (besides using RO/DI water)