You can make a system to aerate that small pond for a few hrs. at night for under a grand.(Including aeration system unless the pond is deep. 8 ft deep, no problem.
Probably should have added a size disclaimer to my disclaimer.
My pond at 17.5 feet deep (at the deepest) and 3 surface acres required at fairly decent pump to achieve the desired air flow at the necessary psi.
Man if I could have a system for under a grand I'd be a very happy JHAP.
Now I need to work on a disclaimer for my disclaimers.