Addressing the questions about not mixing clear with Reef Crystals, let me mention this that can apply to any salt. If you are not going to use the whole container, then you need to dry-mix the salt before you use it. It can settle. I am making this up, but I can probably mix 5 gallons of a RC 50g bag and get alk at 6 and calcium at 600, then the next 5 gallons might be alk of 13 and calcium of 310, but if I mix the whole 50 gallon bag, then it comes out right. I have only really ever used IO and Tropic Marin Pro Reef and they both settle - I had a brief and regrettable side stint with SeaChem (very brief) and it needed mixed too.
Here is my IO routine. Fill up 44g brute with COLD water. Add entire 50g bag of IO. Add 2 tbsp of Dowflake. Mix. Heat. Add 20mls of Muratic Acid. Mix for 2 days. Use. This is perfect SPS water with calcium around 425 and alk around 6.8 to 7.0. I DO NOT need my salt mix to come out perfect, I just need it to be stable and consistent so that I can doctor it up to my liking.