Lava Rock in a Reef Tank
Hello,
Lava rock is not suggested due to the potential concentration of harmful elements. Exactly what I guess would depends on the source. It's one of those situations where you may be okay but there's no gurantee. Generally it's not recommended and if you do, you are on your own.
For the fish stores, don't forget that they always clean their tanks. Whenever I go to Big Als their staff are always cleaning and cleaning.
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