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Angel fish can adjust to your water parameters without any problems, the main thing to do with angel fish is to get them used to your water parameters and maintain that, don't try and change the basic conditions too much, I kept angel fish for many years and have never had R/O water till now. The only problem you will run into is that the angel fish will outgrow your tank, and you will either need to upgrade to a 75 gallon or more, or rehome them. Also keep in mind that angel fish from the petstore will often times die due to stress, so if you want to get one from a store try and get one that has been there for a little while before you bring it home, you don't want to shock the fish too much by changing it from tank to tank to tank.
