PsYcHoTiC_MaDmAn;971807; said:let me clarrify what i ment from my earlier post.
KNOW what your water is, and then work out what levels you think are needed, then work out how much (if any) of the various substances you need to add.
I agree 100%. I found out it is VERY important to understand your source water. I originally wanted to have Discus in my 60-gallon tank. The first time I filled it with water and got all the filters, I measured the pH at 7.0 and felt good about the possibilites of having these beautiful fish. I needed to cycle the tank so no fish, but within 24-hours the pH measured 7.8. Another 24-hours later and the pH was 8.1! I had the water pH (out of faucet and 48-hours later) tested by a laboratory (helps to know the right people) and they confirmed the 7.0 and the jump to 8.1 ... multiple times. My discovery was my tap water coming out of the pipes is 7.0, but once it settles for 24-36 hours it climbs to 8.1 and stays put. So at that pH the Discus were out and the Africans were in (a choice I've turned out to enjoy). All I do is a once-a-week, 10-gallon water change of which I add only 1 tablespoon of baking soda. The soda gets me to a pH of 8.3 to 8.4. The water is already HARD so I don't add anything else.
Water temp = 76-78F
pH = 8.3-8.4
GH = ~180
KH = > 240
TDS = 530
Nitrites and Ammonia have always been zero ... so far.
Nitrates fluctuate between 0-30.
Rod