thats when I check the filters and other equipment ect... make sure the fish are all clean/healthy and otherwise tidy up my fish crap lol.... but when I'm syphoning I set the hose to how low I want it.. and walk away knowing I won't have fish flopping all over from overdoing it... my husband flooded the pool once already because he forgot about it... so I tend to stay in the room w/ the fishtanks during filling... since its the basement its also laundry time ect bleh!...