Im new to planted tanks and i have just finished my 18 gallon planted tank... i have used ADA aqua soil as a substrate and im using a 36 watt 10500 kelvin pl lamp.... are these good enough for my tank..??? if so how long do i keep my lights on..?? and i have noticed bubbles coming out of the soil..?? is this normal..?? oooh and im using an electronic co2 system... dont have a drop checker yet and im wondering how much co2 is needed for my tank. it says here that it produces upto 620 ML.. and theres an adjustment thing called dial.. "the amount of co2 increases in proportion to the dial setting" there are five values 80 100 120 150 and 180.. i have no clue which one to set... :/