Yep, I got 8 harlequins, and they're already shoaling with the gold barbs. I bought 5 black widows, they are a little more skittish but are swimming about in the open as well as keeping out the way in the plants. I bought some tall plants, so they have vegetation and rocks/wood at all levels in the tank. I'm putting them in a new tank tomorrow (today?) that's been set up a week with gravel and filter media from the existing tank, so it should be okay, but I will check levels daily for a couple of weeks, and do twice weekly water changes for a while. I got given an old chipped 4 foot tank, so I'm gonna scrub it out and prepare it for a fry/growing on tank for the livebearers. I do hope they all settle in okay!
Sarah