Hi, welcome to the forum.
What is the LED lighting you've got right now? I take it they're the regular bulb like LEDs you get in toys, etc, not the chip style LEDs that are 'proper' ones?
For your size tank, a small ever grow panel would be good, but if you want aesthetics then the 60/70/80W (or whatever it's at now) Maxspect R420r would be plenty powerful enough and looks great too, also doesn't run fans, it's passively cooled.