The other fish are 4 zebra danios, two guppies (one male one female) and one Bolivian Ram. I only got the ram a couple of days ago, and he/she goes nowhere near the danios. I have seen this particular danio nipping at the others, so I don't think he's being picked on...he's the largest of the bunch. All of the other fish appear just fine, although the ram is a little shy and stays mostly near the bottom of the tank (they're more bottom dwellers anyway, though, aren't they?).
I haven't tested ammonia, nitrite, and nitrate yet. Last I checked ammonia and nitrite were 0 and nitrate was between 10 and 20 (I think...either that or between 5 and 10).
I have not changed anything recently, other than water, and I added the ram and male guppy this Sunday. There was another ram, but I found it dead last night
I noticed a split in this danio's tail a while ago, but I thought it might just heal on its own.
I can try to get a picture, but probably will not be able to...the camera freaks out the fish, so they move away when I try to photograph them. Also, the danios don't stop moving long enough for me to focus.