Get the 6line. One of the best fish to have in a reef tank. They eat flat worms, bristle worms etc, and are pretty good reef citizens. they don’t compete with mandarins for pods, as they readily accept any food. However I don’t recommend attempting to keep a mandarin unless your tank is very well established, preferably with a refugium, to keep you pod population up. I would say 12 months after a tank is established.
I have a 6line wrasse, mystery wrasse, zig zag wrasse, marble wrasse, 2 borb. Anthias, mandarin, pink anthias, diamond goby, coral beauty, and a few more.
Getting all your fish to get along is hit and miss. There is some strategy, but end of the day, any fish can be a bully.
c