09-08-2009, 11:47 AM
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Originally Posted by WisFish
Do you have the T-5 HO (High-Output) version or the standard non-HO fixtures?
I have regular fixtures; they take T8 or T10 tubes, if I have the numbers correct, these are the same wattage, etc., but one of them is thinner and more common now as I believe they are slightly more intense light. I had to replace two of my three fixtures last month (got too old and gave out), and bought a twin-tube T5 HO fixture. It was way too much light over the 70g and 90g, so I tried it over my 115g, and even that was too bright. I have frequently joked that I expected my fish to be asking me for sunglasses.
After a week, (gave it a good tryout) I took it back and got the regular fixture and put my favourite tubes (48-inch) back in. Perfectly fine light, 80 watts over each of the 70g, 90g and 115g aquaria, plants all thriving after years of this [check out my new photos under my Aquariums]. Fish from tropical waters usually need very little light, and as long as the plants are growing, I consider the light sufficient. Many of these fish will pale under brighter light, some develop health issues (cardinals have a light phobia, as Baensch/Rhiel call it), so the least light as long as the plants are thriving, the better.