in order to avoid high bacterial growth levels and having stagnant water, which will give you poor water quality and can lead to bacterial infections and disease in your frogs, you should look into getting a filter or at least a small pump to keep water moving. using a tetra clear choice pond filter 1 (PF1)and 200-600 gph mag drive pump is what i would recommend for a frog pond of 75-300 gallons. most amphibians like slowly moving water and it will help you keep your water quality in check. even in ponds and bogs, where amphibians are common, there is usually still a small creek or undergroung spring that keeps the water in motion and helps keep the micro enviroment healthy. your best bet would still be a talk to someone at a garden center that deals in ponds to get a good idea of what is best for your area and situation.

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