maybe this is why i loose fish then, i do it in a kind of rushed manor, all on the day.. take water out, go to the tap, fill the bucket up with the same ammount thats been taken out(and use water out of the hot tap to bring it up to around the same temp) dechlorinate heavily, pour into jugs one at a time and pour into tank?
is that not ok?
well its, effectively, the same system as mine. I dont loose fish, nor have i(my tank) ever suffered illness. CO2, mainly, effects plants and their growth. my guess is most of us would loose most of our fish, if it had a great effect on stock. but, maybe, the fact i "spray" the water into my container. holding my finger over the outlet, has allowed me to both gas off chlorine( not sure we have moved to chloramines here. perhaps mostly in the USA?) it makes my eyes run whilst doing it, whilst removing CO2 and adding O2 too.
You shouldn't use hot water tap. Your water heater and water line have more junk in it then cold water. I fill up my bucket with cold water and the heat the rest up with water that I heated on the stove.
EDIT: I don't use a teflon coted pot, I use a stainless steel that has been washed out quite a few times to make sure I got residue from normal cleaning off.
I have heard the "No hot water" comment before. yet never had offered any, "real" evidence it is bad. mind you water systems in the UK, may well be safer than elsewhere. though i use cold water, now, for water changes. prior to that, i mixed hot and cold at the tap.
I'm interested in your comments on Teflon pots. why do you hold that view?
to be honest, i use ordinary household buckets and containers, often bought from the £shop. I confess, i only rinse them, it never occurred to me they needed washed lol. as with the "Hot water", there have been no ill effects.