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Agreed, this will give you the most info, you can then just use a flashlight to look around and then you don't have to worry about dirty water or mosquitoes.I would start by draining the pond, you might be surprised at what you find. Nothing in there to harm you, use a sump pump or start a hose up and stick it in the bottom, then turn the water off and take off faucet, let it drain.
Regarding fish, maybe stick a thermometer in there before you drain it and see what your overnight and mid-day temps are with no shade and no plants, that'll give you the worst case scenario.