You're going to have to set the feeder to time at the exact time(s) every day (say 1 PM, 6 PM, etc.). Then change the programming on the plugs for the pump, skimmer, etc. to not run during the predefined feeding period (i.e. if the automatic feeder is going to feed at 1 PM, set the plugs to run to 1 PM, then not to start again until 1:15PM, etc.).
That's about the only way I can see to do it... the challenge is that the Aquatronica in no way knows when that feeder is going to go off... so you need to hardcode the times that it feeds, and configure your plugs to go off around that timeframe.
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