I have a "forgetfulness" issue... twice now I have turned my timer-based topoff ON to raise my water level a little bit and LEFT IT ON ALL DAY. So, to avoid kalk-storming my tank again, I'm wondering if there is any code I can use to turn my topoff on for only a short time (20 min or so) then it turns off by itself. My initial idea was to just use a feed timer, but I'm not sure how to program something to be ON during feed and then turn off when feed timer expires. Possible? (yeah yeah yeah... I know I need to use float switches instead...)