I've heard of chemi clean but never tried it. I'm having a red cyno problem and i just bought a 6 stage RO/DI filter and have done a 16 gal. water change. I still have red cyno i've had it for about 3 months. I hate it it's so ugly and nasty. I've tried everything increased water circulation, i have new bulbs, and done water changes. I just want to know does this work and has anybody used it before.