Unfort it sounds like the pinky was the culprit, im just wondering how you defrost them? The correct way is to put them in2 very luke warm water for literally about 5-10mins then fed it to them straight away. ive got corns and my newest one is an okeetee so shes only 2 months older than yours, i find the best way to feed is with sugar tongs to hold the pinkie (sugar tongs provide the right amount of distance between her and your fingers) and wiggle the pinkie infront of her and it will strike and eat it straight away so theres no chance of it not being eaten and bacteria starting to grow on it. I hope this helps you.