one of my dannio (possibly the one that got flushed out onto my 20*F porch via my python by accident last night) is just barely staying afloat behind my heater. his body is angled upwards and he only kicks his tail fin as he starts to sink a little. it seems to me he's trying to put as little effort as possible into just hovering in one place. is it a possibility he is dying? should i take him out now? i will be working all day tomorrow and don't want him to die and become toxic to my other fish.

