live zooplankton..my parameters are all good ammonia 0, nitrate 0, nitrite 0, phos. 0, calcium 440,ph 8.2, alk. 200ppm..salanity 1.025. led lighting set on low...all of these done with my api test kits and strip test at lfs. I have 4 powerheads at each corner of the tank each 700 gal per hr ...