Kuri,using a emily's garden,with a 400w hps.Think I may be getting this iss "licked" with all of the help in the forum.What I think is that the 400w lamp is to big for this room,so I changed to a 150hps.I now have water temp a 70f,still raising up but not as fast as b4.FUNKYRHINO,I was using tap water in the city,but it is horrible,now using spring water.Fhydro,I think that may be a good idea also,because I did notice that in my spare res. with no air pump ph has yet to move in 1wk as soon as I add air ph went up.So let me make sure I hear you correctly,adjust ph with air,let settle,adjust if necessary then add nutes?