Thanks, guys
I don't know if it was noticed, but in both of the pics, they are at the top of the tank. Is that normal? The first pic shows them playing in the Riccia that's floating in there. They seem to like to play in that, and that can understand. If it was on the ground, I'm sure they would be in it there, too
OH, bad news....I found one dead this morning. No clue what happened, it was just laying there. Didn't look skinney (well, skinney compared to normal for these guys), nor did I notice any fin problems or anything.
The rest seem to be doing well, so I'm not gonna stress on loosing one right now. I'm keeping a close eye on them.