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If you are just misting then a lot of tanks you may never have to drain or drain every year or so.

The key here is misting doesn't not equalfull blown drenching.

Obviously a misting system would probably need more drainIng then hand misting.

 

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I must be doing something very wrong, I use an unused chemical sprayer from lowes and go through a gallon of distilled between my two 20s in less than a week. Imma drain them today and hope that my vivs arent ruined XD....

I use one of those sprayers on my 100 gal but on my 20s I feel it is way too much. Less then 10 pumps (probably more like 5) of a normal spray bottle on "mist" is good enough.