sljs1010

I have a 20 gal tank are those compact bulbs ok to use. I have 2 amazon sword plants and the rest are plastic.

cerianthus

If already have, why not use although PC bulb from 6500-6700 K is recommended for planted tank. I do not know much about your tank, type of bulb (?K), wattage, etc..?

pepetj

I placed two CF rated at 9W over the area where my Black Amazon Swords are planted, they did good, then recently I upgraded to two CF rated at 13W, I expect them to do better.

In another tank, I placed a second standard fluorescent and it works well.

Pepe
Santo Domingo