Have changed around 20 gallons so far. Yeah, my cowrie is only active about once a week then one day it goes through and eats mass amounts but they all grow back quickly.

I went through and removed almost all the cyanobacteria I could over the weekend by hand and the next day I could see colonies all over and in new places and now I have more than before I removed them.

Its upsetting to say the least, will try beefing up the cleaners.