Hey Mike, I just wanted to chime in here.
I've had a 29gl with a coralife fixture two 65w (one 6.7k one 10k ) CFs in it for about 3 years ( of course i change them out about every 9 months or so)that's about 4 watts per gallon. I have Eco complete substrate , some crypts , Java moss, Java ferns, and some Ludwigia Repens. Only dosed Flourish ( not regularly ) and that was it. So, I grew the most lovely, vibrant, flowing black beard algae anyone's ever laid eyes on!!! It grew on everything. And thats about all that grew.
Anyhow, point is , I was fairly ignorant to the whole planted tank thing, until recently. AC folks really helped to educate me.:grinyes:
I just wanted my tank to look like those display tanks at the lfs. That is why i bought it in the first place.:cry:
IME after adding flourish exel for about three weeks, using regular flourish as directed, and doing weekly water changes ( as I've always done ) My BBA has been sent into complete remission
. My plants started growing again ( just wait till i start my macro ferts ). I'm setting up my pressurized Co2 as i type this to lessen the need for exel. And i should receive my dry ferts in the mail any day now.:dance2:
So, to sum up, IME adding alot of lighting to a tank without Co2 and ubalance fert levels leads to agae problems just as everyone has said.