oyster/shells OK?

[surfingdude]

Did some surfing a couple days ago and snagged some shells. Some oyster shells and regular shells. I would assume ok to use in the tank?...from the ocean. Gonna boil them just in case. Planning on putting some corals on them down low in the tank.

Thanks

[humphreyhh]

Shells are OK. Can help raise the ph. Just biol them well.

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