one of them has red spots all the way down it kinda behind the blackish looking scales,,,,and the other seems to not have any red,,,they were both bought from the same place and were in the same tank together,,there was about 8 of them all together and sleeping under a rock together,,,is there a way to tell if ones a female and the other a male? one as soon as i put him in there he sqirted out some nasty looking clear white stuff all over the place,,,the other just went and hide for awhile,,now there both out having fun and eating and just being crazy all over the place,,lol