11-17-2012, 02:22 PM
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Originally Posted by Byron
I would leave the fixture with the two tubes that is closest to the water. You mention Wisteria which needs good light; I cannot grow this plant with two tubes, it does fine (incredibly fine) for a few months, then begins to fail. Mind you, the low GH I have may factor into this too.
I would certainly reduce to two tubes, about 8 hours as someone suggested. Monitor plant growth. Flourish Comprehensive Supplement twice weekly. Flourish Trace, depends. This may not be needed with less light, and also we don't know your GH which is important for the hard minerals in balance.
Excel I would not use, solely because it is a toxic chemical that carries too many risks in my view. I've written elsewhere on this. If you don't touch the substrate there will likely be sufficient CO2 naturally to balance the suggested light.
I have taken one of the fixtures off of the tank and have the timer set for 8 hours. The GH is 79 which I believe translated to 4 of something. I will use the Comprehensive on Monday and Thursday.