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Message: [QUOTE="MitchM, post: 187291, member: 4402"] After I did about a 50% RO/DI water addition, the roses are suffering and 1 died. The vegetables and melon plants are doing better. The water test results were not all that different afterwards: PH 8.2 GH 11 dkh KH 12 dkh I think I'll stick with adding water from the Amazon tank (which I fertilize) and just give the system time to let the PH drop. The roots from the water hyacinth and water lettuce are probably filling about 50% of the aquarium depth and seem to benefiting the most from this setup. Those floating plants have grown now to almost completely cover the surface of the fish tank. [/QUOTE]