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What kinds of fish or shrimp do you want to keep?
Some fish would thrive in water with GH and KH that high.

If you want to keep soft water fish, though, you will have to use softer water. Perhaps reverse osmosis blended with just a little bit of tap water for the minerals.

Research the fish you want to keep.
Seriously Fish ? Feeling fishy?

Most aquarium plants are quite adaptable. There are a few that thrive in specific water types, but most will be fine whichever way you go.
 

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I added too much epsom salts to my aquarium once and the GH went way up, and fish started dying. Though some fish may be able to live with a high GH, it's the quick change that can kill them.
 

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If the stores near you are on the same water system, and have kept the fish in the store for perhaps a week, then the fish will probably be OK in your tank with your tap water.

Adding Epsom salt is not really the proper answer to raising the GH.
GH is a measure of both Ca and Mg. Fish and plants need both.
When you use Epsom salt you are only adding Mg.
To properly raise the GH use a combination of minerals that include both Ca and Mg, in the right ratios.
 
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