What would be the right lamp for my aquarium?

Hi,

I have a 33gal tank with several fish ranging from guppies to gouramis,
barbs, plecos, crabs and almost ten diferent kinds of plants ranging
from small to large plants.

I also haev an aqua glo 20W 55Lux 18k.

Plants looks alright, I see growth, I also see some leafs on some that
are fading, but I guess it's just part of the natural growth of the
plant because it is te bottom leafs that this happens.

But I am just wondering if this is the right lamp for my aquarium.

What would be the most ideal lamp for it?