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Neil's back

> It is true that high intensity light will speed up plant growth, so they
> CAN run out of something. Adding extra nutrients including macronutrients N
> and K can sometimes be tricky. Too much K can be a problem with low Ca and
> regularly adding extra N (nitrate or ammonium)can contribute to P depletion
> in the water column (P in the water is needed by weak rooted stem plants).
> These inbalances can be magnified in a mixed plant community with stem
> plants and heavy feeders like large sword plants. Rather than playing
> chemist, I suggest more frequent water changes. Even if you depend on
> fortified tap water, this will provide better long term stability.

Works for me:)
Have you tried the PC lights yet?
Tom Barr