send the check
as long as the account is legit and all the routing/banking info is correct,
you can write a check on a brick or a watermelon or an anvil... or....
The format of checks is controlled by the Uniform Commercial Code of each state. It's true that you can write a check on a brick or a watermelon, but the intended recipient is not obligated to accept it.
Many companies also charge a non-standard check processing fee.