I've already designed a semi-automated water change system that won't be too hard to setup. My design has a zero chance of overflowing onto the floor, and relies on no sensors or pumps that could fail. The only points of failure could be a stuck solenoid, or a bad relay. Either of which would not create great harm to the tank.Guess I was wrong.
I was just saying it isn't easy... I have no experience with setting one up and shouldn't be commenting anyway, but it seems that from what I've read, auto water change systems are not "easy" to set up.
You could always add Prime at the time of the change too straight into the main tank, without a holding tank using the peristaltic pump you mentioned.Dechlor? Don't know what to say. I've had freshwater tanks for many years and never used it. Haven't seen problems yet.
And the way mine is now, it takes about 2 hours to change 40 gallons, so the new water is going in farily slowly. I believe chlorine will disapate on it's own fairly quickly.