I bought 2 Bolivian Rams from Pets @ home a few months ago and they were in a 48lt tank until i recently got my new 150 litre tank set up, now they are both in here and one of the rams seems to be picking on the other one. seems weird he chases him about from one end of the tank to the other, the one who is being chased seems to of kept the stripes he came with from the shop and the red in the ends of his tail where as the other seems to of lost most of the black but has kept the red. any ideas ?