We've received some interesting feedback concerning water changes recently, so thought we'd post this and see what some of y'all might think. We're just running a small, 43 gallon tank (about 50 lbs. of live rock in it), and do 15-20% water changes about once a month...seems to be working just fine for us. We normally mix up 5 gallons of r/o water with measured amounts of "Instant Ocean", and let it circulate with a submerged powerhead overnight. We then will simply siphon out the old and carefully add the new. We've been doing this for about a year. NOW...what we've heard recently is that we should also be checking the ph value of the water and "adjust it" accordingly. Our ph has been running pretty consistent at 8.0 when we check it (usually in the evening...which is when we do water changes). I guess what I'm curious about is whether anyone is actually pre-adjusting ph, and/or doing any other "dosing" of the new water before it goes into the tank. Thanks!