10-27-2012, 03:12 PM
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I would agree that this is likely going to be too much light. There are some ways to mange this.
First, I'll point out that T5 HO tubes are about 1.5 times more intense (bright) light than the same size and type (spectrum) of T8 tube. I have one T8 over my 29g, and that is low to moderate light. Some plants manage fine, but some would not. Your two tubes will be equavient to 3 of my T8 tubes, or triple the light.
This means you either have to reduce the light or lessen the duration, and increase nutrient supplementation to create a balance. More light than what the plants can use--and this is solely determined by the available nutrients and the plant species--will almost cerainly cause algae to become troublesome.
If the fixture you are getting allows the tubes to be switched on independantly, you're fine. One T5 HO tube is actually good light over a 29g. I've been trying to find one for mine but they are few and far between. Removing a tube doesn't work (unless they are switched separately), as the other tube won't light unless both tubes are present.
Second option is to limit duration. This can partly work, depending upon the nutrients and plants.
On the nutrients, to blance two T5 HO tubes you wil almost certainly need more than just once or twice a week with Flourish Comprehensive. And CO2 may likely be an isue.
All of this takes a bit of experimenting, since each aquarium is biologically different. What I've mentioned above is in general terms.