Kevin,Originally Posted by diskboy
knifefish require shade and some where to shelter and can be difficult but work well with discus provided you provide for their needs. They are a moderately difficult fish to keep.
butterfly fish are very, very difficult to keep and you will need a cover on your aquarium, they can and do jump! they need live food like insects to eat.
leaf fish are very aggressive and I would strongly recommend not to keep them.
angels, well they are a nice easy fish to keep and provided they are thouroughly qt'd can be kept with discus, care MUST be taken at feeding time to make sure the discsu get their share of the food.
ALL new fish will need to be properly QT'd before being put in with any existing fish.
hth,