Coral shark aka marble shark died with no signs of why

Tliguors

New Member
I have a 220 g aggressive salt water tank that I have had up and running for about 6-8 months now. The current inhabitants are
- porcupine puffer
-dogface puffer
-2 voltan lionfish
-banded cat shark

When I first got the cat shark I also purchased a coral shark which died a few days later with pink blotchy spots on his underside and was really stiff (see picture). I figured this was due to my tank being fairly new This occurred about 3 months ago. Last night i checked all my levels in the tank and they were all perfect so I went and got another one figuring that my tank is established enough and everything was stable including the fish that I have in there already. The new shark has the same symptoms as the other one and I have no clue what could have caused it. There are no scrapes, cuts, or abrasions at all on the shark.
 

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g-reef

New Member
may have something to do with the gravel or sand. but i would imagine it would take longer then a day to hurt them.

have you ever treated this tank with copper or other medications
 
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