from what i've gathered [i'm fairly new to this too] a higher rating of WPG [watt per gallon] will allow you to grow a much larger variety of plants. i had a standard 15 watt strip light on my 15, i just upgraded to a 55 watt today, so we'll see how that goes!
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current setup:
5.5 gallon low-light planted tank
-nothing....thinking a mini-community.
for reference: my name is Julie 
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