i had to immediately bring the two cats inside. the temp fell extremely low and they started to bleed from there fins. there was a swelling on the fins fromtwhere they bleed. they are much better now in my three foot tank, the only big enough thing to accomodate them for now. i ordered a pool cover which should help keeping the pond a bit more heated. how much will you think the pond temp will be if i cover it tighthly and fill the water to a depth about two foot.
