Gourami Swami, I have kept the above 6 from your list, and they were all fabulous to keep, I would recommend them all.
The irregulars, wesseli, and lamena, all really need lots of current, as in fast moving stream almost rapids, to get enough oxygen, and live comfortably, they are up there on the difficulty scale.
The ornatum were easiest to keep, the menerabo out grew my 6 ft tanks, in about 2 years (easily hitting 15") and they needed to be in a social group, which made mega tank size even more important.
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Thanks for the advice and great pics! Really a bunch of beautiful fish, of all people on this site I am not surprised that you have kept many of them.
I have not seen ornatum around for a while, would love to grow some out. Tank size is an issue for me at the moment, so many of these are going to have to wait quite a while. I have however, been seeing irregularis available, and may pick some up soon.
The Damba's are quite possibly my favorite from the list, but as you say, I can tell they need a huge tank. Someday...