Dinos are unmistakable under a microscope, especially ostreopsis. Even during the photoperiod they'll be swimming around in their odd, tetherball like fashion. And like I said before, a few seconds in freshwater, and I mean seconds, and those dinos are dead. I've confirmed this with my microscope and with a microbiologist who specializes in dinos. Every new addition gets dipped, including snails. The dipping in tandem with my microscope will ensure that I'll never get dinos again.
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