[After reading diy phytoplankton here, I decide to try it myself. Since I don't have culture disk and Micro Algae Grow, I used DT and Miracle gro and Kent essential elememts. At start, I mixed 2mm MG, 1mm Kent and 1 capful od DT to 2 liter of salt water, I splitted at 7th day, added 1mm MG, 1mm...
