I like it, thanks!I have helped several starters, and recommended the all for reef to some.
They all liked it, and were using it for years.
Most of the time, people stop using it when they have too much consumers like large sps colonies, and switch to a 2,3 or 4 part dosing regimen to cut the cost, as they are generally cheaper per unit of Dkh.
In regards to water changes, you have to gauge that for yourself a bit.
Water changes for chemical balancing, one a month a 10-20% change should be ok when using All for reef.
Water changes as a means of keeping the tank clean can be necessary more frequently if your export systems are not good enough or you have a large fish load for the size tank.
I will be looking into the all for reef for sure, Shall i just follow the instructions regarding dosing till there is a constant Kh of around 8? Do i test the values every day when i start dosing or is this weekly based?