Check this out
Introduction Below, you will find sections about: these guidelines, wrasses which qualify as reef safe, the general requirements, feeding, shipping, quarantine, adding new wrasses to your system, mixing species and genera, the acclimation box, protogynous hermaphroditism & sexual dichromatism,
www.thewrasseguy.com
This is a good guideline but to me it’s a bunch of words and not everyone understands it instantly, here’s it simplified:
Wrasses can be housed together in harmony but when they change gender, harmony can be Brocken if the first wrasse to change is the most aggressive in the genus. My wrasses in my nano tank are:
- M. bipartitus (Blue star leopard wrasse),
- C. Naokoae (Naoko fairy wrasse)
- Pseudocheilinops ataenia (Pink streaked wrasse).
These are all getting along since they’re small and more peaceful wrasse. In my main display (4’ tank), my wrasses are:
- C. melanomarginatus (Black margin fairy wrasse)
- C. lubbocki (Cebu Lubbock’s fairy wrasse)
- C. lubbocki (Indo Lubbock’s fairy wrasse)
- H. Iridis (Radiant wrasse)
- H. chloropterus (Jade wrasse).
These guys shouldnt get along but my group do, The reason these shouldnt all get along is:
1. My two Lubbock’s are part of the same Complex (the lubbocki complex) and two or more wrasses from the same complex shouldnt do alright,
2. My black margin fairy wrasse is part of the scottorum complex and so that complex shouldn’t be housed with other fairy wrasse because they get aggressive towards them,
3. Jade wrasses get VERY aggressive so mine shouldn’t actually be doing well with the 4 other wrasses but they do some how.
Many wrasse owners will say my wrasses shouldn’t be housed together however, my 5 wrasses are coexisting in harmony and even adding other wrasse won’t disturb that (Or so the last one didn’t).
What I’m trying to say is because your two wrasses are from totally different genera, they will get along just add the possum first then add the melanurus. The only wrasse I would put a six line with are the most aggressive wrasses (H. chloropterus and C. melanomarginatus/scottorum).