I have the same size tank and had a really hard time finding a light that small that would handle the corals I wanted. Some of the coralife PC lights are 20" long but the highest wattage is 96. I have seen a 24" t5 on a 20" tank with legs. I don't know if that was stock or not but it is possible. The sunlight tek t5 is a really nice light but I think it has to hang.
I know heat is an issue but the jbj viper metal halide lights look pretty good. I was looking at that for my tank.
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