The interest of $12 should be no problem.
There could be a problem if in the past years you have not been reporting your assets as you should have been.
Assuming you acquired the $30,000 after you filed your previous FAFSA, you would now only report the amount you have as of the date you file the new FAFSA.
Depending on your other FAFSA information and the cost of your school, your eligibility for aid may be reduced, but not necessarily eliminated.
College Financial Aid Consultants
29 Ives Hill Court
Cheshire, CT 06410