First off, when you see MgSO4+7H20 - is this just the long version of Epsom Salt (straight MgSO4)?
Also, I already have 7dGH tap water, but want to start adding a little but of Mg anyway to the water just as an additional booster in case the 7d's is made up of mainly Ca without me knowing it. What is a good amount to add after each water change to 40g's of water? In terms of Teaspoon fraction sizes would be most beneficial. I was thinking 1/2t after each water change.
450g Planted Discus Tank - Work in Process!