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What the heck are these?


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Ok I had to do an emergency 50 gallon water change (scary). I had some water issues and had lost some of my most amazing corals (sad) My wellso and fungia's are in the great reef in the sky now.


Any way as I put the 50 gallons back in the DT the sand dune in the rear of the tank got blown away and left what look like sand stalagmites sticking out of the sand. I have no idea what they are




Any idea what these might be? Sorry for the horrible picture DOH!

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