Terrible advice Tuesdays: Hermit crabs add to your bioload. Therefore, you should limit the number of hermit crabs you have in your tank so you can have more fish.
The rest of the story: Hermit crabs likely add some (emphasis on some) amount to the bioload to your tank as they do produce some waste. However, the amount of waste hermit crabs produce is small…very, very small. Therefore, don’t worry about the bioload from hermit crabs reducing the number of fish you can keep in your tank.