ok right angel fish are from the south american region of the world,,, their inhabitat is usually thick vegetation (slim body) and they ambush their food rather than chasing it,,, the water would normally be in ponds or tribuatories (sorry if spelt wrong) of rivers,, they like very slow current or none at all but obviously in a tank there will be current,,, the best thing to do is put tall plants in the way of the current which will reduce the flow through the tank and you will find once the fish is full sized it sits in the corner with least current,,,,,