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How many watts per gallon should I have on a black water south American tank? It would have swords, valls and moss.

I have a t5 I was using on my 55g, not sure whats the watts are. Ill look later and see.
 

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I'd shoot for 1.5-2.0 wpg of light. Swords and vals grow up to the surface so they'll get plenty of light and since moss doesn't require much 1.5-2.0 should help you avoid algae issues.
 
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