ok I have had trouble with water params lately so to try to get them to come back to where they should be I did ALOT of water changes, cleaned everything in my sump (totally cleaned out), Vacummed substrate, took live rocks out put them in a bucket of old tank water and shook off all the detritus (probably not a good choice). Any way now I have this Brown algae growing on rocks, and substrate. just like what happened when I first got the tank. So is it possible that i cleaned to much to fast, and caused my tank to start the cycle all over again?
