How tall is your tank? And do you have glass covers? I suspect you need 60+watts of LED lights for a tank that big. You can try adding good-looking LED floodlights. You can target a section of the tank and not have the whole tank fully lighted.
I found that buying dimming lights were a life saver..literally!! whatever your plant needs, it can get!I would buy one that you can dim in case it's too much light. I don't think you need to break the bank to buy lights.