Well, I have no tetras on the premises but I believe that the Wide Bar silver dollars are a type of tetra, no? I've seen silver dollars referred to as tetras although I'm of the notion to always think of tetras as small fish.
I disagree. Serrasalmids were until recently classified as a species of tetra, but were redefined as a sister-family instead, mainly on account of their interlocking teeth as I understand it, a decision which is still hotly debated among zoologists. Certain tetras are also considered to be more closely related to piranhas than they are to other tetras, although we won't know the full depth of that until the genome has been properly sequenced. Lastly, Alestids like the congo tetras don't belong to Characidae despite the fact that they absolutely are tetras, and Serrasalmids are closer genetically to Characids as a whole than Alestids are.
So yes I would definitely say that they are tetras.
Mystry Fry revealed: Well a day or two ago I idientified the little guy with some good assurity. As can be seen from the photo I've included, there is a small spot near the tail that is beginning to form. This is the hallmark of the Rosy Barbs that I have in some tanks. None of the other fry that I have raised have this spot. So where did this Rosy come from? Although my mature males were separated from my mature females, I did have some immature Rosy's with the males but apparently they weren't so immature after all. The fish were about 4 months old. (makes me wonder at what age a fish can breed??) The males probably pushed a young female into spawning and that's where the egg came from. I didn't remember there being two filters in that tank, but there must have been, as I must have taken out one for the use for the empty tank. So sadly, it was a big let-down to find out it was a mundane Rosy but hey, I guess it is of interest to learn that moving a sponge filter from one tank to another can lead to eggs or fry getting moved along with it. I learned a lesson here. Nevertheless, I wish to thank everyone who posted with regards to my thread and I appreciate it very much. Thanks a bunch!
