my other strain is doin a lot better but this one some of the plants started turning purple then there are some random brown spots on some leaves ? Is this spider mite damage
The white spots are very concerning. Yes, potentially spider mites. Have you checked for pests? More info: https://www.mrgrowit.com/post/spider-mites-on-cannabis-plants
The brown spots is something different. You plant looks close to harvest so I wouldn't worry much about it. When do you plant to harvest?