dayzofspeed
Fish Herder
while i was watching my fish this evening one of my male dwarf neon rainbows began some strange behaviour that i've never seen before,he began to single out and chase 1 particular head & taillight tetra, he would chase the tetra at high speed and get in front facing the tetra, and angle his head downwards slightly then with a sort of quivering motion shook his head from side to side very rapidly, he did this for a couple of minutes and although curious i thought nothing of it. this then stopped for about 10 minutes when he started over again doing exactly the same thing, it's also worth mentioning that his colour also intensified a bit but not excesively but something that did strike me as strange (because i've never read of it happening)whilst he is posturing at the tetra he develops an orangish stripe which runs along his back from his nose to his dorsal fin, is this just the behaviour of a confused/frustrated male fish with a crush,there are no females of his species at present in my tank, or could there be another explanation i.e madfish disease lol, any suggestions !!!!