I was at petco and got a small pink fish and was wondering if it will grow into a goldfish or remain what they labeled ass a "minnow" and I was also wondering how to care for this small fish it is only 1/4 " long and very tiny

If it was labeled as a minnow and is orange, it's probably a rosy red minnow. You can read about them on my site at http://www.fishpondinfo.com/rosies.htm