I'm going to be setting up a 29g using the Walstad method. Judging by Hoppy's PAR graph, 2 t5ho is what i need. I know this graph shoots watts per gallon out of the water, pardon the pun. So... about the only lights i can find out there are 2x24 t5ho for my size tank. That will put me at 1.6 watts per gallon. I will be using 6500k daylight. IYHO, will this be enough, or will I need more?