I have two newly set up low tech planted tanks, they are identical second hand models (old fluval 10gallon tanks). With single 15w t8 light fittings. The first tank I set up I put an Arcadia tropical bulb in and many of my plants grew leggy and died very quickly. I have changed many species and they are now surviving and after 4 months algae is under control. My second tank has been set up for a week as a moss wall divided betta tank. As I needed a covered tank and I have no way of modifying the hood I have stuck a desktop led grow lamp shining into the sides and a cheap full spectrum daylight t8 in the hood. The plants are all growing well but the hair algae is awful after just a few days. The led grow lamp has turned out to be 50w. Are there ways to fix the imbalance without adding c02? Would having the grow lamp on for a couple of hours instead of 8 be enough for my plants and just have the t8 for the rest of the lighting cycle?