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hi everyone. i am new to fishlore but i know the basics of fishkeeping like the nitrogen cycle. i have a juvenile red tail in my ten gallon right now and i am going to move him to my forty gallon tommorow. i just finished cycling the forty gallon. so my question is, is forty gallons a big enough tank for a single red tail shark? and also could i add some tankmates in the forty gallon? thanks in advance.