I've got the timer and dual airstones on my boat an its still hard to keep crappie alive in summer. I carry a cooler filled with ice an just throw them in it when caught. got 56 Thursday an 83 Friday, crappie an perch mixed, 15-20ft deep on jiggin spoons. kept a dozen Thursday for supper an clients kept 30 Fri for a family fry. had half dozen Fri from 12-14 inches.