I've seen the products that raise GH at my LFS so I can pick one of those up or I can maybe do a 1:2 ratio of hard water/soft water. Now that it's mentioned, it makes sense that plants wouldn't grow in soft water because all the good minerals are taken out.
EDIT: Just tested my carbonate hardness and that is 8. According to the little pamphlet with the test kit, I should make deionized water using API Tap Water Filter. According to Seachem's website, I should have a GH that matches my KH, which ideally should be 3-6. Suddenly keeping fish and plants got a lot more complicated.
EDIT 2: So an API Tap Water Filter is a $50 glorified Brita filter. I just tested the KH of the water from my Brita pitcher and it's 6. Maybe put a Brita filter on the faucet . . .
Last edited by Sakura8; 04-11-2012 at 05:58 PM.