My question is does mixing small quantities of salt water change the parameters of the mix? Recently I bought 3 bags of IO sea salt and mixed a 5 gal bucket and noticed the cal and mag was so low. Bought some IO reef crystals and mixed up 5 gal and it tested even lower. Thought my new test kit was bad so I bought another set of salifert kits and they tested low as well. Getting ready to mix up up some red sea coral pro but was wondering if mixing 5 gal at a time changes the parameters? I've always used IO sea salt but never really payed attention to fresh mixed water parameters but after the past few months of adding coral and some dying and some still alive I'm struggling trying to understand why they are testing low.