You can do that and it works well. The thing you need to be concerned with the cannibalism. They will eat their young. Let the water stand a couple of days before stock to get some mosquito larva started so they have something immediate to eat. The larva will only last about two days.

Put some weeds in it so they have something to lay their eggs on. What are you going to use as feed. They do well on fish food and fish food flakes.

I have kept them in buckets for long periods of time and put them in livestock troughs to control mosquitoes. Tough fish.