Pickle Jar
Just put the jar inside of your 20g heated tank. You may have to find somthing raise it up a bit. Clip your airline to the side of the jar and away ya go. You can easily siphon water with airhose to make small waterchanges in P. Jar.
I found brine shrimp easiet if you hatch a large batch and then freeze it in an ice cube tray, just melt a cube as needed.
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