Re: Agitation ???
well there are a few choices.
1) Air- as you said you dont want to use like an aquarium pump
2) Hybrid- a mix between a motor that both circulates the water and with an air inlet infuses air into the stream (best in my opinion).
3) Just an agitator/bump- An underwater propeller that will circulate the water. Bumping the tank can knock off bubbles but I dont suggest since you may bump off an electrical connection if its weak.
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