A Mag 5 as a return pump on a 20 gallon tank? One of the larger powerheads may provide a more appropriate rate of flow.
In a garage you can put insulation around the outside of the tank. The foil-backed foams found at Lowes and HD would be okay with occasional splashing.
For a small tank a location near a sunny window could provide great light. Perhaps a mirror can re-direct the light as needed.
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