Do large water changes change Ph?

that's one heck of a first post, Phaidout! Good one, and welcome to AC!

Yes, we usually ask for ammonia/nitrite/nitrate readings with every "problem" especially if the fish are doing poorly. But the poster only asked about pH shifts, so that is probably why everyone is responding only to that part.
 
i think we assumed city water because she used dechlorinator.
 
I'd still like to know the kh and gh. Ph of city water can mean nothing if it is all coming from phosphates.
 
Sorry, don't know the kh.
All my other fish are fine... The guppies didn't die from the Ph change, just so you know. They died (I'm assuming it was old age, I bought them full grown and I've had them for a while, and they weren't sick) before the water change.
I bought distilled water from the store, dechlorinated it, did a 3 gallon water change, and the water got back down to its original Ph- about 7.4. So I guess something wierd is going on with my tap water. Also all of my other fish are just fine.

I have noticed that guppies are very fragile. I normally buy them from my LFS, not big chain stores like Petco. I rarely see guppies at Petco that aren't sick anymore. But the 2 that are still alive are very healthy, in fact one has lived through an ich infection that a few of its tankmates had and never got sick.

Normally I let the water I am going to do a change with sit for a few days before actually doing the water change. Maybe that made a difference?
 
Distilled water does not require dechlorination.
 
I know, LOL. :rolleyes: Found that out after I did the change.... :idea:
 
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