"chris nuttall" wrote in message
om...
my tap water is ph 7 with a kh of 11 degrees
my tank water is also ph 7 with a maximum kh of 8 or 9 (it keeps
dropping see my other post called ph kh snails and clown loach)
i get falling kh and ultimately ph, so i want to add buffering
capacity to the water to maintain ph 7.0 if possible, but i am worried
that coral will buffer it up to 8 ish.....i just dont want to kill any
fish by experimenting.

chris

Chris,

You should be OK with coral. Add a small amount, say a cup per 10 gallons
and test daily. If your KH is not satisfactory after a week (too low), add
more coral.

My tap water is very similar to yours, but my PH WAS falling below 6, even
with weekly water changes. I had 'old tank syndrome' sneak up on me. I added
about four cups of coral to my 55 gallon and my KH has stayed around 150 and
my PH is between 7 and 7.5. It's never been anywhere near 8, but I do weekly
water changes as I said.