Makes sure it is a 5000 to 6500k thats the clor spectrum needed to grow in veg up until flowing then you need warm white 2700ish buy the biggest bulb you can afford.No I would not grow them in the fish tank, the glass with concentrate heat and make it really hot in there, plus it will a biznatch to light seal that bad boy up (2) 120w bulbs may work for the time being, depending on what type of lamps they are, if your going on the cheap go to HomePo and get your self some CFL's (the ones that looks like a pigs tail) and you will be alot better.