05-01-2013, 08:04 PM
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That is a huge GH range, from 70 to 582 or something. I suggest you test your tap water for GH. Rather than buying a kit, if you have a good local fish store they may do this for you. It is GH, general hardness, we want, and make sure they give you the number from the test, whatever format it may be. "Hard" or "OK" is of no value, but the number we can understand.
Second, I suspect your Vallisneria is melting due to the Excel (liquid carbon) you were using. Vallisneria is one plant genus that often melts with these chemicals. You've decided to stop using this, that is a wise decision. The Vall may recover.
The Flourish Comprehensive Supplement once a week, and the root tabs for larger plants are fine.