06-07-2011, 07:25 PM
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I agree, the culprit(s) could have been any one or all of the fish mentioned.
I would tend to discount the angels themselves, since aggression always occurs from one dominant fish, and it would not be "beat up" or killed, unless of course two very dominant males were in the trio, but that is not likely given your info that it was a pair and an offspring. But it is still important to realize that angels should be in groups of 5 or more, except for a breeding pair on their own, and all fish in the group should be acquired together. This is explained in our profile, click on the shaded name Pterophyllum scalare
to see it.
The shark is highly aggressive to substrate fish, and often they will lash out at other fish too. The small tank size can aggravate this, but as the fish matures it becomes more feisty regardless.
The featherfin is the least likely suspect, but as it attains 8-12 inches it needs a new home anyway.