It an an argonite/crushed coral/sand mix.
I have a two full 5gal buckets available. You might want to grab them soon.
They are in water, but not heated or under filtration any more....I shut my tank down.
Free....but if no-one grabs them by Sunday, I will rinse out the sand and reuse it in the spring.
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265 gal reef display, 60 gal sump, 20 gal fuge, +/- a few other tanks
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