I didn't have any blooms after the third installment of dinos finally effed off. Took a while for the coolia, but I didn't treat it. It just pooped out on its own after a while. The ostreopsis was a nightmare though. I had to manually remove that crap to keep it from killing inhabitants. Luckily I only lost most of my snails. No corals, nems or others. Frickin dinos, man.Ostreopsis to amphidinium+prorocentrum. I dosed Microbacter7, Waste Away, silicates, Nitrate, Phosphate and ran UV 24/7 (except for turning it off for a short time after adding bacteria. Never saw a diatom "bloom" but I gradually saw diatoms replace dinos on the slides I looked at. It was a long process but I've been dino free for several months now.