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Those would be perfect eben, many pet stores use those for koi and their pond goldfish. Also i have seen a shallow one filled with lava rock , with a pipe spraying water from the fish tanks over it. Recirculated back to the tanks to grow the bacteria i was talking about. With a mature system like this that has been cycled you could hold a ton of herring without many deaths, much higher then with just airation and ammonia chips.
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