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I'm slowly bringing my tank back from a state of dirty, basically maintaining the big 3 and let the po4 and no3 to rise to .08 and 5 ppm respectively(both were 0) , I also removed most of my sand bed. I stopped UV, carbon and skimming for about 3 weeks and did small water changes. I've resumed carbon and skimming.
I now get a green film on the glass daily where before dinos it was a week, no more brown film on the glass, I use 10uM filter socks on my drains which I change every 2 days. Looking at the tank I can't tell I have dinos but under the microscope I still see a few in my skimmate and socks but they seem deformed and are weak swimmers, I've started culturing phyto to rebuild the micro fauna and critters that were destroyed by FM algaeX (trying to get rid of bubble algae) which I believe are what keep the dinos in check. Hopefully this is the nail in the dino coffin.
Ostreopsis Ovata.
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