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It also has the property of encouraging bacteria that's good for the fish to have, so I wouldn't use that.
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Ummm, no it doesn't
It will kill off the beneficial bacteria in an aquarium. That's why you setup a 10 gallon "hospital tank" for dosing fish with it, so you don't kill off your nitrogen cycle bacterial beds in your main aquarium. Most of it comes with quite explicit instructions regarding this issue.
Digital - won't hurt your blocks or tubing. (try it in one of your metal test cups if you wish)