You can put a 24" T5HO fixture on a 10 gallon tank if it has adjustable legs. That's what I have. it hangs out over the edge of the tank 2 inches on each side but it really isn't noticeable or a problem. That will give you alot of variety in the colours of bulbs you run. i have 2 14,000K bulbs and 2 actinic and i really like the colours.
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