108 watt of T5HO's is what I have on my 55 gallon, lights on only 6 hours a day, heavily planted and I have a problem with green spot algae.

Prior to this light, I had 130 watt of compact lighting and never had an algae problem with lights on even more hours.

The T5HO's are high output and I can't imagine 108 watts on 29 gallons.