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Marble Shrimp

Live phytoplankton do get brought in from time to time. Unless you are experienced in phytoplankton culture, I do not recommend that you attempt it to feed your tank. If you harvest the phytoplankton too early, you end up pouring excess nutrients into your tank. If you harvest too late, the nutrition of the phytoplankton is not there. Those packaged for aquarium use have already been harvested at the optimal growth period for optimal nutrition and could have been separated physically from the growth media. As such, you do not end up pouring excess nutrients into your tank.