I've never removed my frogs for this. I figured the stress of being caught, moved out and back might be worse for them than a few whiffs of vinegar. The fan disperses this rather quickly. I also need to do this a couple of times a week, since the problem tank is a paludarium--combination aquarium/vivarium for galacs and our well water, albeit very pure, is also very hard as it runs through a limestone aquifer. I've never noticed that the vinegar odor bothers them at all. They just continue their frog activities, one of which is to hop as close as they can get to see if I'm presenting more food. Colchicine may have a point I haven't reasoned out, however.
There's a product on the market called "Aquarium Safe" that is supposed to work, but doesn't. You are supposed to spray it on and let it sit for 3 minutes before wiping. In the meantime, it all dribbles off into the water, merely rearranging the pattern of the deposits somewhat, so after a few trials of this, I gave it up. It's also quite expensive.
If your waterway is small enough (my paludarium isn't) you could also use commercial spring water for drinking. For my smaller set-ups, I get this from WinCo or Wall Mart for about 69 to 79 cents a gallon and use it in the misters, as well. I haven't noticed any significant deposits with this.
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Patty
Lost River, Idaho
4 D. auratus blue
3 D. galactonotus pumpkin orange splash back
5 D. imitator
4 D. leukomelas
4 D. pumilio Bastimentos