HarleyK;614074; said:
Just because they survive does not mean it is appropriate care for them. The dedicated fishkeeper optimizes tank variables according to the fishes' needs.
HarleyK
HarleyK, these fish do much more than merely survive in water temps outside (higher temps) their generally considered ideal temp range... They thrive.
Just take a look into the average ornamental pond during the summer months, most are to shallow, improperly shaded and hence maintain a relatively high daytime temp.
More than just algae is thriving in these ponds, Goldies, Koi and Carp are too.
Thriving... Growing, feeding and breeding better than in most aquaria by far.
6'>deep pond of sufficient area, icecapped in winter... Not a problem with minor care.
3'<deep pond of sufficient area, 75-80"F+ in the summer... They don't GAF.
Really, temp is the last area of concern when keeping these fish happy/thriving.