This is probably on here somewhere, but does an ATS remove enough dissolved organic compound to prevent cyano. I’m currently having a real bad time with it, even though I do regular large water changes and use a skimmer(Bubble King), and use carbon, low fish count, feed minimally, and use ozone, oh, and use GFO. After much research, the best answer is DOC build up, I’m not sure what else to do till I get my scrubber built.