Auto water changes

[ReefMadness]

in theory its a really good idea as stability is the goal.... however, you really need a solid set up to do it. a reliable dosing pump, outlet run to a drain and a constant supply of pre-mixed saltwater sitting a the right specific gravity.
miss one of those things and it either risks your system, your house and/or the equipment. plus if you aren't doing it daily you are already defeating the purpose of "continuous" water changes.
i'm also not big on the idea that you are basically pulling new water out with the old water continuously whereas with a normal water change people generally pull the dirty water out and replace with new, clean water.
bottom line, its just too many moving parts for me.