11-25-2007, 10:04 PM
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That's an interesting question, to which I don't know the answer.
My thinking is, however, that if properly sealed it shouldn't cause any problems. How, though, do you plan on sealing it entirely with silicone? If you are using a silicone gun I think it would be very footery and difficult to make sure there were no little gaps, nor would it look very good as it'd be really hard to get smooth.
If it wasn't sealed, I would guess it would release calcium into the water and possibly raise ph, like when cuttlefish is added to a tank, which is basically a bone. This is just my guess however, hopefully someone else will have a more definitive answer for you.