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I wouldn't do that big of a change. Tbh I'd pick a different fish, damsels are mean. Chromis are good starter fush
. I did 10% a week for 3 years. Several months ago, I cut it back to 10% every 2 weeks just to see. Most people do about 10% a week, though.Yes I have a 20 gallon that I'm getting ready to set up as QT. I'll do a 20 % water change and use my RODI water. I was thinking about getting a clown fish. Now once a week should I do a water change? 10% or 20%? I want to get a routine down pat so I can stay on it regularly. I don't plan on getting any tangs or aggressive fish just looking to keep colorful smaller fish. Gobies, Blennies, Clown fish.
Forgive me, but shouldn't your salinity be at 1.026? not 23, I would raise it up, but then again maybe im mistaken, I didn't read all the posts.

1.023 is on the low side, your not mistaken![]()

