09-30-2012, 12:48 PM
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Misakitty, are you familiar with our fish profiles? Second tab fro the left in the blue bar across the top of the page. If the scientific or common name used in the profile is typed identically in a post it shades, and becomes a link to the profile, example Oto Catfish or Otocinclus macrospilus.
In each profile it lists the "preferred" water parameters, including temp range, for the species. That of the oto is 21-26C or 70-79F. So, I would not maintain them above 79F. All fish, with very few exceptions, fare better at the mid-range for their species; at higher temperatures the physical metabolism has to work in overtime, so to speak, just to maintain the fish's internal balances, and this can weaken the fish and reduce the efficiency of its immune system to fend off disease.