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I recently tore down my reef tank and sold off all of the equipment and livestock. I still have the live rock in a brute trash can with salt water. The tank only ran for about 4 months, so there is not much life in the rock because I started with dry rock.

Can I use this rock in a cichlid tank? It's MarcoRock. It's kind of expensive to use the rock, but it will save me a lot of hassle for getting rock. There are not many options near me for rock and I drive a small car.
 

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you can use it but clean it all with fresh water first.
 

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Agreed, I'd probably bleach it to kill off anything that may be living in it, then let it soak in fresh water while monitoring the ammonia levels. If you get ammonia, (or an obvious bad smell) then you've got dead, decaying things, and you'll need to let that process play out before using it in your tank. You can try cleaning the rock, or just keep changing the water until you no longer get ammonia readings. Use dechlor to deal with the bleach and/or let the rocks dry out really well.
 
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