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I looked up the "recipe for hardness" and figured I should add potassium and magnesium to help the plants. Am I right to assume so?
If you have access to Wonder Shells, I've been using them for about a year now and haven't seen any signs of deficiencies in my plants (except iron, but that isn't added by Wonder Shells). I also only had to add a couple small ones to my 6.5g at the beginning and it's kept the hardness up since (it's gone slightly down with some water changes and plants using the nutrients, but still quite high). I'm coming from water with GH 0.
 
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