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Been wanting to keep rice fish (or maybe other cold tolerant fish, not sure how low rice fish can go) outside, but I’ve got some questions. Was thinking about wrapping a water barrel, tote, or stock tank in insulation, and building a wood structure around it (just for aesthetic reasons) and keeping the fish in that with sponge filtration. Could sponge filtration be enough for approximately 55 gallons? Do I need heat or just to prevent the top from icing over? And maybe a doubt question but can stock rank heaters be used for fish?