I'm trying to get mosquito larvae for my fish to eat. I have a container with about a little more than a liter of water in it. I filled it with half rainwater and half water from one of my fish tanks. It has a large rock at the bottom of it and some dried leaves to make stained water. It has a few twigs half way out of the water too. There is some algae growing in the container as well. I have kept the container in a shaded area under a large bush. It has been there for over a week now with no larvae. I check 3 times a day but I can't seem to get any larvae in it. Is there something I'm doing wrong? Thanks in advance.