[littlefrog]

I guess this is the right place for it... As part of my greenhouse rebuilding project I installed two long and shallow 'ponds' under my benches in the greenhouse. For thermal mass, mainly, although in a crisis I might tap them for watering needs if I run out of the good stuff.

The 'ponds' are two cinderblocks high, with pond liner so they will hold water. They run most of the length of the greenhouse (one is 36' long, the other 42'), and they are about 3.5 feet wide. Maybe 14" of water depth. One of them actually sticks out several feet from the end of the bench, so that I can grow a few pond plants in actual light, but the majority of the pond surface is under my benches and has an opaque cover (sheets of 1" foam insulation, cheaper and lighter than plywood) to keep most of the plant debris out.

That is the background. But I need a few fine fish for a couple specific purposes. One, algae control. Two, mosquito control. I can already see the mosquitos breeding, and I'd rather not be swatting them all winter. So, I'm seeking recommendations from you fish people. I need fish that will take 55-60F in the winter, require minimal maintenance (I can feed fish but I'd rather not do it often), and don't need a lot of light. Oh, and I have to be able to find the fish for sale somewhere, that is important too!!!

Any fish experts want to help me out?