3.1 wpg enough in 75cm?
Ok, I currently have a Coralife 2x65w PC fixture waiting in the wings to be placed above my 29 gallon. I've been contemplating selling it and buying an ADA 75cm and placing the fixture above that. I want to be able to grow anything ranging from copious amounts of HC, to cyperus H., rotala rotundofolia, rotala nanjean, urtricula g., and some needle leaf java fern (microsorum sp.) Until I had this idea of the 75cm everything was good. But now it seems that I may not have enough light for the plants to really thrive. The 75cm is 42g which would leave me with 3.1wpg, and I'm not getting rid of that fixture. If this isnt enough, I was contemplating getting a 2x18w t5 fixture to accompany the 2x65w PC. They are both 30'' and will fit perfectly over the tank... what I'm wondering is do I need the t5, or would the PC be sufficient. With the t5 the tank would be getting a total of exactly 4wpg, which is what I feel more comfortable with atleast right now. some opinions and valid arguments may be able to sway me, but 3.1wpg seems like a tad too little. What do you guys think?
other specs- pres. CO2, filstar xP3, ADA ferts and AS and PS, Manzanita via badcopnofishtank