I target feed reef roids - Recently have been using PolypLabs Polyp Booster - turn off return pump but let vortechs circulate in lagoon mode (slow gentle) put in 1ml and let circulate for 10 mins then target feed all corals with syringe, let sit for 15 mins then turn on return pump. My duncans and torches are blooming, frogspawn has added a few heads, hammer has better color. Too early to say for SPS. No adverse Nitrates so far.