Yeah, its just a matter of the amount of time and effort that you are willing to invest in culturing and harvesting these live foods.
Usually the simpler the process the longer you can sustain the interest in keeping them.
Btw, i did also try adding a small sponge filter (the XinYou brand one with directional spout) attached to the side of the 10 liter culture tank. The air flow was tuned low enough to just create a gentle ripple on the water surface. It helped to further reduce the oily film and smell build up over time, without affecting the worms population growth.
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