Two Clarkii, or???

[mrs.som]

I just picked up what I think are two juvenile Clarkii yesterday. One is about 3/4 the size of the other one. The larger one has a small white mark on the top of his tail and his tail is about half black. The smaller on the other hand has no white tip and a pure yellow tail. Are they both Clarkii or were they mislabeled? The store had about three of the smaller ones but I got the bigger one because he was so lively and seemed to interact with me. I've also heard that having one slightly larger juv will increase the chances of a successful pairing. Anyway, I just want to make sure they are both Clarkii, otherwise I will insist on a return.


(Pardon the smeary glass!)

Thanks in advance!