This is an interesting discussion. I live in Louisville too, right near Poplar Level and Eastern Parkway. Back the last time I tested the tap water (over a year ago), the pH came in around 7.6, and there was no ammonia and just the barest hint of color on the nitrates test. I have a BRAND NEW water line, which was installed about a month before I last tested. It's all flexible tubing and pvc piping, no metal in the entire house except the hot line right after the water heater, which is copper.
The pH in one of my 125g tanks, because of driftwood and other things, tends to hover around 5.5, sometimes lower. I fill straight out of the tap with prime, and the pH can push all the way back up to 7 in the span of about 30 minutes. Then over the span of about a day it drops back down to around 5.5. I've NEVER seen the fish exhibit any sort of distress from this. They are always happy as can be, and usually think I'm going to feed them. I can almost guarantee you that when I do a water change, one of the pairs of fish is going to spawn.
I also fill up with colder water than the tank has (tank sits around 80F, I fill with about 70-75F). I use a sump, with a drip plate, and so there is more than enough aeration. But I still like to add slightly cooler water. It seems to get the fish moving a little bit, and they're always more "in the mood" after a water change
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The pH in one of my 125g tanks, because of driftwood and other things, tends to hover around 5.5, sometimes lower. I fill straight out of the tap with prime, and the pH can push all the way back up to 7 in the span of about 30 minutes. Then over the span of about a day it drops back down to around 5.5. I've NEVER seen the fish exhibit any sort of distress from this. They are always happy as can be, and usually think I'm going to feed them. I can almost guarantee you that when I do a water change, one of the pairs of fish is going to spawn.
I also fill up with colder water than the tank has (tank sits around 80F, I fill with about 70-75F). I use a sump, with a drip plate, and so there is more than enough aeration. But I still like to add slightly cooler water. It seems to get the fish moving a little bit, and they're always more "in the mood" after a water change