Hi, I am battling high calcium parameters in my tank lately. Its seems I am not the only one now and theres also great discussion on the causes of it on MASA. At this stage the discussions on the possible causes are concentrated around : the saltmix used (the correct/or not, mixture therof), or faulty test kits. 1. What has been established so far is that the problem tanks in question have all been using Seachem Reefsalt. Seachem Reefsalt are being sold at very special rates by the LFS' the past few months so naturally a lot of reefers are using it! OR, 2. Our test kits: As we are presumably all using different test kits, it will be near impossible to establish "good" from "bad" brands. As with all things in life, there will also be personal preferences. My question is: I'm using API test kits that is not readily available nor widely used in South Africa. I buy it in Houston when I visit threre. It came highly recommended by the LFS shops in Houston and also online by Fosters&Smith Aqauatics. Have been using it for more than a year now and are really pleased with API as they are extremely user friendly. I have tested them to Salifert and Tropic Marin getting the same results. Are you familiar with API test kits and what is your opinion on them.