The hole in the elbow is a siphon break, what you are experiencing is surface tension. If you can remove the tubing from the output of the stirrer it will help. If you absolutely need the tube section then orienting it so the bend goes slightly upwards will help. Usually the surface tension break is about 1/2 fl oz so this is a very slow addition to the tank.
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Dan
Don't rush art, you get bad art.
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