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That's how I do it now, except I allow the fish to pass around the coral on the left side, too.
There are a couple of problems with this. First, where "is" the fish? I use the 0,0 position of the mesh, but the fins stick out quite far from that at their 90-degree position.
Second, the fish is moving. When it wants to start its turn, the position may be legal, but still interfere with the coral or other fish during the turn.
Bear in mind that I obviously know how to "strong-arm" the fish and force it on a mechanical path which would keep it away from the coral at all times, but the whole difference between my aquarium and the rest is the lifelike nature of the movement. In giving the fish free will, all I can do is "suggest" that it stay away from the coral. Making it WANT to stay away from the coral is where the problem lies.
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