Nice to see a dedicated Harlie subforum here

I love 'em, they're a great beginner fish as they're so easy to keep.
I have 7 in my 12 gallon tank. A couple weeks ago some movement caught my eye; I first thought one of them was in convulsions or having a seizure or something, then I noticed there were two together.
Best as I can describe, they were behind a large flat leaf most of the time but from what I could see they were rubbing each other side by side. I wondered if they might be mating...they haven't done it since.
I looked for eggs but I've enough pond snails around that they might have been eaten.
I've just never seen that before. Of course when I cautiously approached the tank for a better look they stopped....