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im currently holding the temp at 74F.I have a bunch of fancy goldfish and i read that they like water temp of about 75 to 80. should i just leave it alone??? :? :? :? :?
Goldfish like cooler water around 70F or so. 74F is on the higher end of Golfish temp scale. 80F would be pusing it unless you had a specific reason to have the tank that high.
Actually fancies prefer a slightly higher temp then common goldfish; however, commons do best around 74-76F, fancies 74-78F, so your guys should be fine.
Fancy Goldfish, i.e ryukins, orandas, fantails do like slightly warmer water as most have been tank bred as opposed to the larger common and koi which traditionally were kept in out door ponds. I have had my Ryukin's and Orandas at about 76-78 deg (same as the house a.c.) for goin on 2 years and they are thriving.
My fancy goldfish are doing fine at about 76 to 78 degrees. I think it has a lot to do with where they are bred and acclimated. Obviously plunging a fancy into an 80 degree tank after being raised in a 70 degree tank for its whole life mightnot be the best idea.