serial32 just cabbaged onto about 30 lbs of slate/granite that we hydrohammered out of a foundation we dug last week.......it looks really cool in his tank, I'm scared to put it in my salt tank though

Boss

I've-used-sand-and-gravel-from-the-beach-as-well-as-large-egg-shaped-rocks-and-boulders-from-a-particular-beach..

I-also-found-a-really-cool-rock-that's-round-on-top-and-flat-on-the-bottom.....The-rock-has-an-almost-glass-like-texture-with-something-like-a-rind-of-a-different-glass-like-rock-in-patches-on-its-surface....There-may-be-pics-in-my-profile-of-it.....It's-kind-of-grey/white,-and-it's-an-onopened-geod......It's-one-of-those-rocks-that-when-broken-or-cut-open-has-a-cavity-of-crystals-inside.

I'm-leaving-it-unopend-because-I-like-it-in-it's-virgin-state.

I-also-use-some-seashells-and-even-peices-of-dead-coral-I-found-in-an-aquarium-store-dumster-for-decoration-and-sometimes-to-replentish-calcium-the-snails-use-for-their-shells.

geode {gee-ode}
it's a round or egg shaped rock that has a cavity inside full of crystals, ive sen em oink, purple, blueish and pure white and any where from baseball sized to one in Howe Caverns hre in NY on display that is about 3 feet tall and 2 feet wide - - im really not sure what causes them but i would assume it's a heat compression phenominon....im sure PK can school us, lol

Boss

I just collected rocks from the desert of arizona, new mexico, california and used them against the natural gravel.