I have 65 gallon tall with many low light plants like Amazons, hornwort ect and they don't look like they are suppose to. Most of my plants lack color and I know its most likely due to my lighting? I have the light that came with the tank and Im wondering on if I need to invest in some better lighting. I want my plants to be solid green not light green or looking like they are detiriorating. Also I dont have any kind of CO2 in the tank either.