You can over skim depending on what you're keeping. It's always better to have something on the larger size since most skimmers are under rated but overkill isn't always a good thing.
I run my skimmer on a half duty cycle overnight as running it 24-7 was causing problems.
On the tank size in question I wouldn't even run a skimmer, the volume is too small. Weekly water changes will be more than adequate.
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