07-31-2011, 01:47 PM
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I currently have glowlights and harlequins in a 20 tall, they seem to get along great, intermingling quite a bit.
One thing you may want to consider is that although they have distinctly different morphology, they are very much frrom the same color palette. So you won't have the same great contrast in color that you have now, if that is something that is important to you.
Having said that, the harlequins are great fish; hardy, peaceful, nice colors, you really can't go wrong with them.
I guess one option would be (if you rehome the cochus) to add harlequins and a group of other fish. I think black neons are underrated, with their red eyes and lime green iridescent line, they are really nice, especially once they get settled in a well-planted tank.
Byron could adise you better about compatibility and stocking numbers, but I think you may have room.