I have a forty gallon Discus tank and I use RO-DI water in it. It is a planted tank so I just skim the surface of the substrate going deeper will damage the roots. Also I do 25% water change every other day due to the finicky nature of Discus. Most other tank are every other week except a goldfish tank they are a very dirty fish and require more frequent changes. Just my opinion.
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I believe Reefkeeping is not a hobby but a way of life It's unfortunate mine is at a stand still!
Building a 135 reef 9 years in the making(seem like I'll never get this 1 together! Too Busy with the Nano and Pico tanks
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