White cloud moutain minnows like an ideal temp of 72F, so I would say that
the raised temp is your problem, the cory's will be ok in that temp too. I
would aim for a compromise of 74 degrees and see how they get on.

HTH
Tiddleye

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"JT"  wrote in message
news:bc9iob$hvg$1{at}news.ox.ac.uk...
> I wonder if 26 deg C (79F) is too high for white cloud mountain minnows? I
> noticed that they've recently stopped swimming around, and
"shimmy" around
> the rear of the tank. They've also become uninterested in feeding -
> previously they're the first to get the food. The temperature rose after I
> installed a 23w pump in the sump, which must be heating the water up quite
a
> bit.
>
> I suspect it's the temperature because I presume minnows are cool water
> fish? I also keep neon tetras and corydoras in the same tank, and these
seem
> ok.
>
>
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