If you don't use RO water for your tanks, you can just use distilled water to mix the ferts with to keep from any possible issues with mixing with tap, but I don't know if any issues that could have.
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38 Gallon Bowfront Planted w/ Angelfish, GBR, Rummynose, Corydoras Aeneus albino, Mystery & Nerite snails
2x 5 Gallon planted with betta, Mystery & Nerite Snails
40 Gallon Breeder Planted w/ Blue Tetra