Hello! I've just adopted an 8 month old male cat to hang out with my seven year old female cat. I have been slowly introducing them and recently let them mingle for a minute. The new cat seems fine, but the resident cat hisses when the new cat is near (they are fine just seeing each other.) this makes the new cat's tail puff up. I feel like this is pretty reasonable but I'm not sure... As long as no fights break out am I ok continuing supervised visits or should I take it a step back?