Hi! I think your problem may be air incoming inside the tank. Just a little bit of air (no enough for liking) can do what you say. I had a similar problem but with the mini dud.
Yes, Needs to step. I used to step no less than 5 days. And 2 drops per 10 ml is enough for me. I put 2 drops of koolada and a little methol cristal as well.
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