Cap't. Try getting in touch with your local NRCS, or a company that sells water softners. They both might be able to direct you to a place that will test water. The water softner company might be able to do a test themselves.

You could have tadpoles dying over the winter and they are just now floating up. If you are seeing dying tadpoles then I'd suspect water quality issues. Amphibians are very touchy about water quality. Has there been any crop spraying close by?

The fish, OTOH, could just have been stressed during the move. While 4 is a high percentage, I wouldn't worry about it unless you started to see more dying. If the water is still cool, the fish will be hanging out deeper and be really hard to see.

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