Oh yeah The PH starts out with a freash mix at 5.5 and by the next day its about 6.0 and I adjust it down to 5.6 once and from there it goes up to 5.9 to 6.1. I try not to add much ph up or down and as long as its not over 6.0 I leave it, if for some reason it goes down I wont do anything unles it hits 5.5 and then I will bring it up to 5.8 and leave it. I forgot to mention each bucket has 3 SWEETWATER air stones in them and 1Alta AL80 air pump does the job of delivering 20 litres of air per minute to each bucket. The res also has a chiller plumbed to it and a 18 watt uv sterilizer, the nute temps are kept at a steady 68 F, Peace