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So hi. I have 2 cherry shrimp, 6 neon tetras, and a patch of micro sword. I own a 10 gallon tank. I would like to install Brazilian pennywort as a mid/background plant. I heard that it slows down growth in softer water. Should I harden it? How? And what new fish should I get for this hard water? I am planning to get the optimal 4+ inches a week from the pennywort, and apparently hard water helps that a ton. I WOULD like new fish as well, as around 6 inches of fish just jumped out of my tank. Any suggestions? Thanks!