Originally Posted by
Discus Origins
Mauro, they are jumpers and will always jump when frightened...during WC, feeding, sudden movement, etc. You will just have to keep an eye on them. As for being fragile, the marble are more so than silver hatchets. In my experience it's better to buy a group and keep them in a separate tank ie 20g tank and get them acclimated before putting in the show tank. I experienced usually 50% mortality rates with the marbles but the ones that made it thru the first few weeks did well.