Could these e added to my tank ?

[twiddlemuffin]

I'm new to this, so if I do something wrong forgive me haha. I've had these stone glossy egg things sitting around for awhile & I just had a thought they would look nice in my tank. Could I put them in ? If so, would I have to do anything to them beforehand ? Thank you in advanced.

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[Cynic]

Link isn't working but if they're stone it should be fine. The fact that they're glossy could be concerning but if you've had them for a while it seems unlikely it isn't just the polish of the material.

 

[Steelhawke]

Try putting vinegar on them, if it bubbles up, don't put them in, they will deteriorate in your tank and mess up your water.