Coco and Hesi

I'm going to be starting my first coco grow in the next couple of weeks. I've been doing soil with GH go box nutes and have had decent success, and now would like to try it out with coco. Just a few questions.

1. I know you should rinse the coco to get rid of excess salts, so... Is the best way to just put it in a rubbermaid with holes drilled in and run the hose through it till the runoff is clear? then add a little bit of CaMg (I still have a little left from the GO Box)?

2. I've read people using Epsom to help with Mg. Ill be using the Hesi starter kit, will I need to use anything else like CaMg or Epsom? And if so which one?

Thanks for the help if I left anything out just let me know.
 
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