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It is not that they don't get along, it is that most fish are too fast for the slow moving ponies. Seahorses are slow and deliberate, if you put in a fish that is much faster than they are...the horses will die because they will never get any food.
Seahorses are also incredibly timid. Even if they are with another fish that is a slow eater, they may be to afraid to eat. They are stressed and scared quite easily by other fish.