Lets see now.... you have one tube with 36 watts. Two more woulkd be 108 watts then? Thats 3.6 wpg on a 30 gal tank! More than enough for most plants.
Eheim pimp #128, 55gal 13x20x48, Eheim Pro 2227, CO2 injected, into the filter breather tube,4x 55w Pcs , 12 hr light cycle (sunrise/sunset simulated), Milwaukee SMS 122, faulty bubble counter replaced with M3 bubble counter..... moderately Planted, Plantex CSM+B and ferts
To steal ideas from one person is plagiarism; to steal from many is research