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Two T8 bulbs is too much light for a 10 gallon tank, unless you use CO2 and adjust it to the optimum bubble rate for your set-up. And, with that much light you need to be dosing nitrates, phosphates, potassium, and trace elements. Also, using that much light, and avoiding lots of algae problems requires that you do very good tank maintenance, keeping the tank glass clean, the filter clean, the hoses clean, the substrate clean, etc.

If you run only one bulb, you will be in the low light range, where CO2 isn't essential, fertilizing isn't nearly as important, and you can be a lot more relaxed about your tank maintenance.
 
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