08-28-2011, 01:50 PM
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That makes a difference. Two Aqueon 18-inch tubes will not be sufficient in my view.
You have two options. To go with the existing fixture, I would suggest Power-Glo tubes (also Hagen). More intense than even Life-Glo, though I personally do not like the purplish hue. But that is what I expect the Aqueon give, so you may like it. The light intensity is there, so again the plants are fine. What you perceive is a matter of personal preference. I prefer the cooler white light which Life-glo would give. These are the best tubes I know of, but it is still on the minimal side, though it may work and be worth a try if a new fixture is not in the picture.
Second option is a new fixture, a single 48-inch T5 will work or a dual 48-inch T8. A single T8 is also doable, I used to have one on my former 55g, but it will limit you more than the other two.