i have had my bees for 3 years they are NWC. i have never treated them i have 3 hives that are strong for this time of the year. i am worried they will swarm they are so full of bees. i thought i would add empty frame, so i pulled out a frame and add a empty frame to keep them busy. the frame i pulled out. i took a tooth pick and uncapped some of the brood and it had mites. i uncaped and pulled out all the larva i found 8 mites in the frame of brood. should i be getting worried.