If it's usually at it's post with fans out than it's doing good! I have mine in a planted 20, which is small for several filter feeders, so I supplement regularly, especially if I see them picking at the substrate. I use a wide variety of supplements including ground spirunlia wafers/flakes, liquid phyto/zooplankton, bbs, microworms, OSI invert micro food, and even powdered and liquid fry foods. Most of the stuff I just have on hand anyway, but the OSI food and plankton liquid I get for them specifically.