I'm pretty new to planted tanks. My set up so far is as follows: T8 lighting 2 x 40W tubes, 10 hours a day, with reflectors supplied with the unit. Pressurised CO2 used to bring pH down from 7.4 to 6.9 Flourite substate and JBL Ferropol fertiliser (when I remember!). Growth seems a little on the slow side, so I was wondering about an upgrade to T5 lights. I can't realistically see a way of screwing extra lighting units onto the setup I've got, so I was thinking of replacing the T8 unit with a T5 unit. The LFS said the T5 unit was 54W and 90 odd pounds. Any advice please?