Bill

Your plants are'nt doing well because they have nothing to munch on!!! You
say your Nitrates are NIL. Either remove 2 thirds of all WH or add more fish
to keep the balance. I would just remove most of the plants that are'nt
looking too hot and give it a week or so. The Nitrate should build up again
and your plants will flourish. Also add that Potash aswell.
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**So long, and thanks for all the fish!**