HI Al,
The plan for the short term is to do 20-30% every odd day as im very lightly stocked for the size of the tank.
i like most are always looking for another way (easier) i must admit though part of the hobby is the enjoyment of husbandry keeps me out of trouble lol.
I wwill add some crushed coral though to boost the KH id rather use that i think its easier to control rather then using chemicals ?