Thinking about getting the coral life t5 HO for my 40 gallon breeder. it puts out 78 watts. which puts me at about 2 watts per gallon... (i know thats not a accurate way of determinating if it would be enough light but i dont really understand PAR lol). Would i need to use co2 to compinsate the light? and if so can i just use a liquid co2? i would really appreciate youre guys input.. thanks