i have a freshwater tank with red ludwigia, aponogeton, and something i'm not sure of planted in mixed large and small smooth gravel. the tank is 30 gallons and 30x12x18. It came with an incandescent light which i understand is underpowered and not up to the task of providing for the plants my gf spontaneously purchased. is a 20w light okay for 3 plants, one of which we might be willing to remove? the 20w fluorescents are cheap and i would purchase a bulb that provided the correct sort of light. is this going to be enough? if not is there a solution under $100 CDN that would be?