Eos Petro (EOPT) 8-K Changes in Registrant's Certifying Accountant

Exhibit 16.1

November 14, 2012

Securities and Exchange Commission

100 F Street, NW

Washington, D.C. 20549

Re: Cellteck, Inc.

We have read the statements included under Item 4.01 of Form 8-K to be filed by Cellteck, Inc. We agree with the statements made in response to that Item insofar as they relate to our Firm.

Very truly yours,

/s/ Madsen & Associates CPA's, Inc.

Madsen & Associates CPA's, Inc.

Murray, UT 84107