I've done alot of low light tanks with plants over the years. lets face it.. I just prefer live plants to fake ones.. I can tell the difference. But I'm interested in taking my planted system to bigger and better things. ATM I have a 20H running a Hagen T5HO TT.. My question is.. If I upgrade my tank to a 37T Do I need more lighting? as it is I battle algae constantly.. and if I'm reading right I'm in the "High" light range w/out CO2.. I would like to get into trying my hand at CO2 as well but for the 20 could not justify it. Will I need to upgrade my lighting? or will I be good? I'de like to stay in the mid-high range as atm I have dwarf chain swords, and would like some other high light loving plants.