Don't beat yourself up too bad. Live and learn. The crabs ... well odds are they are fine, just hiding in spots you didn't even know existed in your live rock. Crabs are good at that.
But here's the bad news. The yellow tang really doesn't belong in a 20g. Maybe if he's small for now but he'll outgrow that tank in a matter of months. As for invertebrates though they are usually safe with them.
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-- Tony
My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee!
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