Hi i recently started culturing phytoplankton for my 300 gallon tank. I started off with just a liter to get the hang of things and i was getting great results. Now i have moved on to 2.5 gallons culturing started off with it 1/3 full and as soon as it began to get dark i would add 1liter of water with 3ml of phyto fertilizer, i have worked up to 3/4 full but now i notice this waste mud on the bottom not sure if i should filter it out or mix it with my harvest. Also i have one air pump and light running on it.