I have a 75 gallon tank and I want to buy a tek t5 lighting for it. Do you think four bulbs will do the job? What do you guys recommend? I really want to be practical when it comes to lighting so can anyone pls tell me if it will really benefit me to get the 6 vs the 4 lamps. Is it also worth the price difference. I live in Canada and here the t5 with 6 bulbs are worth 200 more than the 4 bulbs tek. Do you guys know anyone who can send me this item from US?