I was under the impression they were egg scatters...In which the male would chase the female endlessly around and around, eventually stimulating her to lay....I've witnessed Tinfoils rub vigourusly on each other one time at a lfs....I was amazed and whatched it....Note that I am not a Tinfoil fan(far from it), so this was big for me to whatch....After about 5 minutes they would stop and do it again....Out of the 20 or so 6 inch individuals in the tank, these two were the only ones at it....But, I saw no signs of eggs....WHere am I going with this, I do not know....Maybe you have a pair....If so, congrats....