Beautiful Angel Fish, love the color. Also the pleco. Plecos are really silly fish, I enjoy watching them. My inside pleco is really shy, he sticks his head under a rock and thinks no one can see him. Here's a pick of him attached to his favorite food, zucchini slices. This was a year or so ago, he's a bit bigger now. I have noticed that he has slowed down on the growing which is really good.
Our air temp lows for the year are around 18°C but of course the water in the ponds doesn't get that cold. Generally in the winter we get that temp a few times at night when a cold front is passing. The good part about the concrete ponds is that they hold their temp really well and aren't subject to wide swings. The cattle trough on the roof is not so good, I think that is why nothing does as well up there as in the other ponds.