i havent read all the threads so forgive me if someone has already posted this, i wa reading one at top from where you said you wanted:
2 clowns
1 sixline wrasse
1 manderin
firstly, the eel is WAY to big for the tank as you know.
they grow to 5ft long lol, need about a 7ft tank to house one of them lol
and the sixline will kill the manderin.
they both eat copepods, the sixline will eat other stuff too, but not the manderin, anyways, they both will compete for the copepods, and the manderin is not a fish for fighting, it will get killed by the sixline.
IMO out of the two id get the manderin, but firstly get a refugium, and pour a bottle of copepods into it, lave it for 2 months at least, then add the manerin so it can have food.
will need to top up the copepods once a month or so.
i think this will be a nice stocklist for you:
2x clowns (percs or ocellaris or B/W)
1x flame angel (beautiful brightly coloured fish!)
1x chalk goby
3x lyletail anthias
1x green manderin (after a year like you said)
that would be a nice, outgoing, and colourful stocklist.
also with say 2 cleaner shrimp, and a few snails as a CUC.
i recommend against a cleaner wrasse strongly.
with bigger fish their fine but with smaller fish such as ones in a 55g they will annoy the fish and may even end up eating away the fishes flesh instead of cleaning it.
a cleaner shrimp will clean them instead of kill them.
a cleaner wrasse with that eel would work, but i dont think it would with smaller fish.