Why do you need a skimmer really on a 29G? If it's stocked properly, all you need is water changes weekly or even every two weeks. IMO there should only be 2-3 fish in a 29 anyways and since they would be smaller fish, why spend the money on a small skimmer? They are relatively expensive (for what they are) and not very efficient. The problem is skimmer designs need WAY more contact time and these small models just don't give it.
I have had no problem keeping several nano tanks over the years with no skimmer.
Personally I would save the money and grow some macro instead. For a small tank sits much more efficient and cheaper by far.
Good luck!
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