The CUC picks at the stuff from time to time, but not enough to notice any difference. I see the hermits sifting the sand that has the brown stuff all on it. The snails seem to eat it off the tank walls. They never do enough to see any difference.
The tank is 15 feet from a large window that lights the room. Could be sun light?
I will try to get a picture. This stuff went away for some time on its own and then came back with vengeance!
Also, I tested my RO
water for phosphates and the color just MIGHT be that of 0.25ppm! (0 and 0.25ppm look very close to me) My DI
resin still looks black, so I dont know why it would be failing. It still tests 0TDS on the digital meter...
I have also put back on my old Current Sundial light to rule out the current one I was using. This drops the power from 160W of T5 to 96W of T5. What do you guys think? 160W seems like alot of light over a 20g tank, no? Maybe I will measure the bulb temperature on the Sundial and compare to what I was getting with the souped up light. (IceCap driving VHO