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Those options you listed for 2.5g and 5.5g tanks are perfectly fine for FW also. The only thing that really matters here, in case you don't already know, is to stay away from actinics or 50/50 bulbs. Actinics are worthless for FW, and some people argue that they are downright bad for FW tanks.

But really, what went for nano SW tanks will work for nano FW tanks. Unless you were into the high-light coral reef tanks... if so, you will have to start thinking in terms of less wattage.

But at least in the examples you gave above, those will be fine, although 32w in a 5.5g canopy might require the addition of some CO2 or Flourish Excel.
 
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