Mmmmm my rope fish will probably hit 2'. And that's if they decide to stay on the smaller side. >__>
I can hardly find any info on rope fish tank mates.
I know the the ctenopoma, bichir, butterfly fish, kribensis, congo tetra, african knife and syno will all do fine together.
But aqua advisor (of all places) says that once I add the rope fish I gotta watch out for my congos and kribs.
A 55 gallon tank is 12" wide. I don't think a 12" long fish would have a fun time turning around in a tank like that.