Six line doesnt have to have pods but it will benefit from them. They are foragers and will pick off pods, flatworms, even heard that they will eat bristle worms. Main diet will be what you feed. The foxface is considered with caution in a reef. Never had a pink watchman I did have a sleepier banded goby was such a great looking fish but make sure you have a screen top with either of those. My banded went carpet surfing. To be honest....if it was me...I would go with the clowns or a dotty back. Both are semi aggressive, if you add a bigger fish like a fox face or a flame angel later I dont think it would much of a issue. Six line later will be just to fast for them to chase down. My dotty back charges my chromis at feeding time but they get along ok otherwise and he has never bothered my mandarin.