I regularly use phytoplankton to feed corals in my 120 gallon mixed reef tank. I realize that my tank is now an oversized phytoplankton reactor. There is a green haze on the glass every 8 hours. Fleece roller is forest green and going quickly. Can you have too much? I usually dose 2-4 cups of home grown phyto throughout the week. Replacing the main batch every month or two.