hi bud, nice tank, looks good for sure, as idleivey said More light does not mean that your plants will grow faster, for optimum plant growth you will need CO2 along with high light. if you just increase your light without co2 you will end up with a tank full of algae. many ppl have managed to get decent growth with DIY co2 but i personally think if you have the money go get a pressurized co2 cos you can control the co2 input. with diy co2 there will always be a change of Co2 fluctuation which will again promote algae.
Its your choice bud, but if you dont want to use co2 , then make sure you don't use more lighting. just keep adding seachem Excel (its supplement for CO2)and other plant supplement with the same amt of lighting and you will have a stable and algae free tank.
Also one of your pic shows brown algae in your glass,
so my guess is its a new tank if it is then its usually because of Excess silicates & nitrates, in your case lighting is fine.
this is what i found for you**** "Brown algae is a common occurrence in a newly set up aquarium. It is generally caused by too little light, an excess of silicates, an abundance of nutrients, and too little oxygen. Silicates can build up through tap water that is high in silicic acid, and silicates that leech from some types of substrates"
The best thing for you to do is to perform regular water changes once or twice a week for sure 10 to 20%. Make sure you are using water conditioner to remove harmful content from tap water. one of the best one i think is seachem PRIME but diff ppl use diff products whichever suits you buy that. Buy a water test kit nd thats all