Have you ever noticed how banner, butterfly and angel-fish always come in pairs? And if you only see one to start off with then the second one is never far behind? And they have that lovely twisting motion of figure of eights around one another. The trick trying to capture these types of fish is to observe, don’t chase the fish, watch and learn to choose your moment. If you see one of the pair look around for the second, generally this will tell you where the fish is going to move to, anticipate. 9 times out of 10 if you just focus on one of the pair the other will follow it into frame making for a more complete composition.