Retired to watch the grass grow.
AFN Global Moderator
I use to leave mine on also until I lost a plant to crown rot. It happened just below the hydroton level and I did not see it until it was too late.I've always left top feed on the whole time without problems.
My original system was a GenHydro Ecogrower that has only top feed, and no air stones.
I've used it that way, and the plants were fine, but I now also use air stones.
Apparently GH's opinion about leaving top feed on the whole time matches my experience.