120 Gallon Plant Tank -Lights,Substrate

[Spine]

I just broke down my(48x24x124) 120 gal. Reef tank and I want to turn it into a plant tank.The tank has a overflow and sump is this a problem if I'm going to you CO2? I also have two 10K 175w Metal halide bulbs do I need both for plants or is one good enough. For substrate I have a 50 lb. bag of Pro Choice Soilmaster Select do I need the whole bag? or how many inches of substate would you recemend.


Thanks,
Kevin

[suezahn]

I just bought the same 50 lb. bag of Soilmaster--at least I'm not alone on this.

Oh, and that 110-gal tank we talked about was already given away, sorry.