I'd keep something in mind here Bob:
The rule is a mainstay for freshwater fish because many release inhibitor hormones that limit their size based on the water volumes around them. A survival strategy that makes sure the fish doesn't outgrow its potential food sources.
I remember reading somewhere (vague, I know, but I've read it for sure) that marine fish do not rely on this strategy since the ocean, in contrast with freshwater systems, is exponentially bigger.
That being said, though captive angels grow pretty slow, they still grow. I've seen some pretty deformed koran angels; products of 20 gallon tanks. Someone go tell them that they weren't suppose to grow any bigger.
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This and that.
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