4 18" T-8 tubes of various brands (all meant for aquariums) with home depot
electronic ballast in a homemade hood. So 60 watts over 20 gallons, with
CO2. It all works well. The plants almost grow two fast. I prune every two
weeks or more. I have no fast growing stem plants. when I did I would
prune at least once a week.

Scott


"Phil Williamson" wrote in message
news
What lighting do you have over your 20gal tank?

"Scott Rogahn" wrote in message
...
I would like to set up a 55 to 100 gallon planted tank (I already have a
planted 20 gal) To maintain 3 wpg florescent or even power compact seems
to
be a bit difficult, 8 4ft florescent tubes for 100 gal. So I think
metal
halide may be a better choice. Does the 3 wpg gallon rule apply to
metal
halide? Would one pendant over the center provide even light or do I
need
two? Would 2 175-watt pendants be too much over a 55, how about a 100.

I would also consider something like in place of the pendants


http://www.drsfostersmith.com/produc...=20 04+113354

The tank would have a pressurized CO2 system.

Thanks
Scott