Just out of interest, what are the upper and lower temperature limits beyond which fancies would not be safe?
Thanks
Pixie

There are no specific temps - so much depends on the tank/pond size, the amount of aeration available, the filtration and water parameters, and, of course, the fish themselves.

That said, healthy adult fish do well in temps from about 65F to about 85F for most of the year. This is assuming that they are in water with good parameters, sufficiant aeration and adequate volume.

Some breeds of fancy goldfish do better in water that is 68-82F (70-80F)- the long, delicately tailed fish like Veils, Broadtails and Phoenix. The commons, comets, Shubies and other more streamlined fish have a much wider temperature range in which they are comfortable.

Anytime you have temps that are quite chilly, you have to be on the lookout for ich and other opportunistic parasites that can rear their ugly heads. Anytime you have temps much over about 82-85F you need to make sure there is plenty of oxygen.

It is said that blacks do better in cooler temps - the higher temps have a way of bronzing out the bellies of susceptible black fish.

Some breeds of pond fish (the true, old fashioned streamlined, deep black English Black Moor is one) that thrive in very cool temps - 50s through 60s) and simply do not do very well much about 75F.

Wow! Thank you Daryl - this was very informative.
I'm glad the upper limit is as high as 85 as it makes me not worry too much about the hot weather. Mine are fancies and I always notice how if the change water is warmer than the tank, they will often release quite a lot of poop - I know their digestive function is helped by warmer water. I'm keeping mine around 76 at the moment but may move it up a notch.
Thanks again
Pixie

My tanks have heaters in them, there temps are 76-78F, the heaters are on all year long, since were i live the temp can change. I agree with Daryl great advice about temps.

I know some people dont like heaters in there tank, but i think that i helps in so many ways and less problems keeping them at a certain temp.

when i leave my koiand common goldfish in my pond for winter the water gets to be something like 34 degrees, but at that temp their bodies go into "hibernation" until spring. and for breeding reasons some other guy on a website said the lowest is 64 degrees.

that 64F is for the Fancy goldfish, they dont do well with temps lower than that. Thats why you dont find Fancies in ponds in places were the pond will freeze over, they just dont do well in lower temps.

yea i figured that out right in the heart of the winter blizzard we had this winter, and who was in the ice frozen over pond but my prized fantail dani!!! i was so nervous because i thought all goldies could stay in there over the winter. i waited and waited for the ice to melt..................... when the ice eventually all melted i looked to see if he was in there, looked up and down and all around with no luck. i was sad because he was gone, i couldnt even find his body the pond then progressed for a few weeks and i was sure now that he was gone for good. until........... i take out the debris basket before the pond pad and there he was swimmin around in the darn filter box under the basket!! i was soo happy he was alive!! another fish was under there also!! i took him out of the water and i hugged him!! (Not Really lol jk) he did great up until sadly he just died a month ago of a disease that is still lingering over my pond (see disease section) sorry i know this belongs somewhere else, but that just triggered my memory and i thought it was the right time lol.

Thanks everyone

i like to keep my fantail tank's temp. at around 70F-78F. i don't have a heater though...its summer