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Question--- wife an i want a porcupine puffer. Can't have him in my reef tank. So the plan is to free up one of our living rooms fresh water tanks. I have two 75s side by side behind the coach. Would a 75g tank be OK for just one with some rock and sand. Nothing else, no other tank mates. So one tank will have a puffer and the other will have a dinnerplate albino oscar. Google says 100 min.