i have a 29 gallon tank with a 24inch 20 watt coralife 50/50 bulb and a emperor 400 filter. also the tank has about 30lbs of rock. i have two florida flower/rock anemone and 3 mushroom polyps that are doing great. all my level are normal and its a well established tank. what are some different type of non-photosynthetic i could put it that tank?