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Just the same, a nitrate removal system would be great for a system this size. I am a firm believer in water changes, but it will get expensive on this scale. Think about it ; 500 gallons approximately for just the breeding system alone. If he does a 20% change once a week, that's 100 gallons, at 20 cents a gallon for water and salt, that's 20$/week, 80$+ a month, 1040$ a year. He's got three systems!
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