I would put up a DIY co2 reactor. You can use greg watson ferts for great control, but seachem flourish will also work well. Still need to know the size of the tank, and how many hours, and at what time the tank gets the lighting. Also, it is VERY important to know what fish are stocked, and what kind of filter. If you don't have enough fish to produce co2, or have a hob or air driven filter the tank will have very small amounts of co2 which will cause the plants to grow very slowly, and algae to take off. A good amount of fish stocked will provide a good amount of co2 just have no surface agitation at all. A small powerhead to move the water is all that is necessary, and the plants will take care of filtering the water.