Aging water for Trimac?

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In the winter months here the water mains carry an excessive amount of co2, so much that when doing large water changes it can strip the slime coat off of certain species such as discus. When II kept H .temporalis it would peel the slime coat off in big sheets like snot. I gave away a nice mated pair years ago for that reason. It was like dipping a fish in coca cola.
Wow. Never experienced that. I was aware of the CO2 effect but hadn't seen it that extreme. Where I am I just make an allowance for water changes to rise a few tenths to stay within my target pH range.

In theory it can work the other way as water absorbs CO2 from the atmosphere, which is why distilled water starts at pH 7 but can go lower with no other effect than exposure to air... or so I've read.

Another instance of something I often say: there's not always a one size fits all answer to a question. Sometimes you have to take opinions with a grain of salt and do what works with your own tanks and water.
 
I'm no chemist, and never mess with pH etc, and I was pretty bummed about my pair of chocolate cichlids. Summer months all good, winter months anything over 20% caused slime coat irritation. They were a stunning pair but because of the winter water chemistry here I had to give them up.
 
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