I am also looking into cheap lighting for my 20 gallon tall and I have found online that you can use a strip light or shop light that they sale at lowes or home depot. Get a piece of glass cut to put on top of tank and use the shop light above. I am not sure yet how to put the light if you just place on top or if you have to hang it.
You can go on lowes and they have a 24" for around 12 dollars but I am not sure if it comes with a bulb or not.
I also thought about building a wooden canopy and getting a under cabinet light and screwing it into the canopy. That would not be expensive as long as you can have someone build the canopy for you.
Good luck
I will post back when I finally decide what I'm going to do
You can go on lowes and they have a 24" for around 12 dollars but I am not sure if it comes with a bulb or not.
I also thought about building a wooden canopy and getting a under cabinet light and screwing it into the canopy. That would not be expensive as long as you can have someone build the canopy for you.
Good luck
I will post back when I finally decide what I'm going to do