After two months at the LFS and two weeks in QT, I did add the melanarus two days ago to my 90. I did get a female melanarus that is much smaller and different in markings. There was a bit of a chase at first, so I turned off the lights till morning.
On day two, they didn't seem to be having much issues with each other, actually swimming right by one another. Both fish got their fill at feeding time without any issues. It seems funny as the melanarus has been going to sleep around 8PM while the venusta does at 10. They both went to sleep as normal, but for two hours I swear the venusta was looking around for the other fish. Usually he swims around in the water column while occassionally glancing at the sand/rocks, but last night he was looking in all the nooks and crannies in the rocks. Hopefully it is a good sign.
I'll post some pics if I get some, they never stop moving so pics are hard to get.