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That's a cool rock, I don't know what it is but I'll throw out a guess, maybe agatized coral, as for an aquarium I'd be careful, over time minerals from whatever that rock is could leach out and kill your fish.
Agree with above. I have used rock that was just rock but I had African ciclids and they are tough and like hard water. If you have a bunch of tanks put it in one that doesn't have any quality fish in it and see what happens. Rinse the hell out of it first.
BTW, how old is your house and has anyone asked to detect it before? lol
I knew I mispelled cichlids! It's been years since I gave up on tanks.
Saltwater is even scarier putting anything in it that you have no assurance....
Now, back to metal detecting your yard......lol