05-31-2012, 03:18 PM
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Going back in this thread, i see we did look at this previously, but now we have a bit more info. I'm fairly certain this is HO light, the linked data says this (on the package) and it makes sense, so we'll assume that it is T5 HO. This is a 75g tank, and the tubes are 34 inch, so using both should be manageable. Duration might have to be less, particularly with few plants, or you will have algae soup. The Life-Glo II is a good tube, expensive but good, I use the T8 Life-Flo as one of two tubes over my large tanks and the only tube on my single-tube tanks. The Aqueon tubes should be near-identical so it is fine. When it comes time to replace these, you could do one 6700K and one higher Kelvin, or stay with two much the same (6500K-6700K).
I see no reason to spend money on another fixture, if this one lights the tank. Lots of floating plants. Tubes need replacing every 12-18 months, they lose sufficient intensity to be risky after that.