It depends on the configuration. You can put less in a high tank than a low (breeder) tank. I'd say 5 or 6 adults in 40 gallon with a good biological filter. The broken rule of thumb is a little more than 1 per 10 gallons.
I have almost no current just a small wisper filter and the tank has been established for 4 weeks I am not planning on getting another for atleast another month. Is that long enough to establish a good biological filter?
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