I am using a Zacro automatic feeder in anticipation of being away for six weeks. It is set to feed 2X a day. I am working with it now in anticipation of leaving.I am having a lot of trouble getting a consistent feeding. A very small change in the opening results in too little or too much food dispensed. I crushed up the flakes and this helped (large flakes were blocking), but still inconsistent. I am considering using pellets for their uniformity, but am concerned my top feeding fish and lack of corys (I have Seachem flourite substrate) will be an issue. Too, I want a pellet that is suitable for daily use over time. Please give me your thoughts. Very much appreciated!!