It's driving me crazy. My SPS tank is running with zero nitrates and zero phosphates and I can't get it up! It's an all wrasse tank so I feed it 3-4 times a day. I run the skimmer only at night and I'm leery of running it less simply because of the other benefits of turning over the water. The tank has roughly a four gallon refugium that I'm guessing is working overtime -- although it's not growing Chaeto particularly fast. I haven't had to harvest any yet although it's almost full now. The Chaeto is healthy and a nice green. I feed the pods and the Chaeto once a week with Phyto and rotifers. SPS is growing well and healthy -- best PE extension I've ever gotten. Colors look great on most colors although the Walt Disney isn't getting much in the way of pinks and blues and the Bubblegum Digi doesn't have yellow tips. Thoughts?