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Back when I started my tanks with "fresh" live rock I got a lot of crabs. The way I caught them was to rubber band a piece of shrimp to a small rock and put it in the bottom of a tall drinking glass. Lean the glass up against your rock after the lights go out. The crab will slide down the...

I've never heard of damage to a tank because of a canopy. Almost everybody has canopies that rest on the tank rim. I have two and both of them support Metal Halide ballasts which are very heavy. They've been there for eight years with no problem.

Conchs are a type of snail and they can't change shells. It might be some kind of whelk. As a rule of thumb, snails with dark colored flesh can be predatory. I'd keep an eye on it and be ready to get it out if it eats anything that it shouldn't.