Planted Tank Guru
Join Date: Mar 2012
Location: Space Coast, Florida
it really depends on what you want to do with your tank. i have a tank with the standard light fixture and 20watt bulb that runs 9hrs a day on a 10 gal tank and plants grow fine.
i also have a T5NO running 11-14hrs a day, plus root tabs, on a 29gal and the plants in there do just fine.
and then i have a 10 gal tank with with 2 CFLs at 20watts each that runs about 10hrs a day
do you want to go with high light, low light, or something in between? if you can give some idea of what direction you want to go we can help you get just what you need.