Are you going to beat them to death with that Stop sign?
how much should i give it for a 5 gal rez?The Zone will work, but go easy, as I have recently learned, because it contains chloramine and that will kill beneficial microbes.
I've been using it at 2ml gallon for mature plant for fungus gnats. It makes your res a bit 'sudsy" appearing for awhile. As I have recently learned myself, too much can fry your roots so I would stick to adding it when you do res change outs, etc......Don't just add it every other day or something becausee I believe the chlormine will build up to a toxic level.