They are both apprx 4"-5" long and one appears to have more red on the fins than the other .. I woudl assume but have no basis for this that it would make it a male or female as the other doesnt have nearly the markings.
Answers:
The colors of a tinfoil barb are not conducive of sex, unfortunately. The only way to determine if your fish is male or female is to look at its size. A female, that is ready to spawn, is slightly larger in the abdomen than a male, who is decidedly more slender.
The rubbing up against each other may be a mating ritual, although its very rare for these barbs to breed in captivity. Its more likely a social behavior, or even perhaps an indication of an external parasite like ick (you need to look at your fish closely to hopefully rule out this possibility).
One more thing about these barbs, as I have owned them in the past; be prepared for them to get -very- large. Their fully gown size is between 13 and 14 inches, so make sure they have a big enough tank to live in. one with a very secure lid, as they are great jumpers!
Good luck!
They may have ick and it itches. Look for small white dots on them.
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