PWC = partial water change As for thing done in the past to reduce N, PWCs, skimmer, filter sock, water changes, adding LR For P reduction, same as above and also limiting dried pellet and careful selection of other prepared food, Brightwell products (can't remember which), RowaPHOS ($$) Regarding the current P I have done nothing to try to reduce it. I accidentally left the lights on the scrubber on 24/7 and they dropped to 0.03 but then, curiously enough, I had a dino outbreak. Still haven't quite figured out why, but could be related to the screen partially dying when a fish got stuck on the intake pump for a day or two while I was gone, those events were both pretty close to the outbreak. They rebounded to 0.13 in no time. I use RO/DI 0ppm top off so unless by BRS 2-part has Phos in it I'm at a loss. I was going to start adding Calcium Nitrate but decided not to 'cause it ain't broke. The reason for doing that is because algae needs N and P to grow, so in this case N=0.000 (on Salifert) so P is not absorbed, it's called Nitrate Limitation (can happen the other way too and you are then Phosphate limited) and you have to actually add Nitrate to get the P down. lol. As far as growth, it's not my primary concern. Things grow at a decent pace. The slower the growth, the more dense the coral. Tank is way too crowded as it is!!