Well, a little more info is in order. I am currently fighting a dinoflagellate infestation in the 210. I cannot find a reason for this. I have 0 silicates and phosphates, I am not overfeeding the tank (only feed a small pinch of flakes twice a week for the Coral Beauty, the only two other fish are a cleaner wrasse, and a green mandarin) amm/n/n are all at zero, all water is RO/DI, have shortened the light cycle, and even running ozone to burn up unmeasured organics that the dinos might be living off of. Was giving a large volume water change a shot. And yes, I pumped the water out the front door with a Rio 1100 with tubing on the effluent end. The problem was bringing that much RO/DI mixed saltwater BACK into the living room from the garage. Had to do it in 20 gallon increments on a wagon, then pumped into my 75-gallon sump. Forgot to mention that as well, so it is actually about a 25% water change. Any tips on the dinos would be much appreciated as well.