Two fuzzies in not power feeding at all, not for the age of that king. My garter is a year old and just was moved up from two fuzzies. For being a year old an eating pinkies, she most likely was/ is under weight. You will need to eventually get a bigger tank. A 20 gal. Long at the least, but bigger is always better(provided with enough hiding spaces) . And pictures would be nice.
Anyways, welcome to the forums

I hoped I helped some