Aged 9 and 11, they just learned how to take 30 gallons out of my sump, carry partial 5 gal buckets upstairs and dump in the sink, how to start a siphon (my son now knows I was serious when I said you don't want a mouthful of saltwater!), then how to add 30 gallons back into the sump. I showed them how I measure salt and check the salinity. Once all the water was back in the system they got to push the buttons in Fusion to turn everything on the Apex back on. I think they actually enjoyed it, maybe a couple of future reefers in the making!