Hi guys, I bought two firefish yesterday to my 20g long to keep my clown company. After drip acclimating them for an hour I scooped them out with a cup and put them in my tank. As most firefish they hid immediately under the live rock. I observed them and saw that only one of the firefish came out once to explore the tank. It was outside from hiding for a minute and went back with the other one in their cave. The next day in the morning everything seemed fine. The two firefish were cuddling under the live rock and it looked so cute!
The same firefish came out a couple of times to swim around but the other one stayed under the rocks. after several hours it finally came out but darted around the tank and stayed in one corner. I was worried and didn't know what to do. It had labored breathing and coughed after several breaths. When I observed more closely it was coughing out sand! after a minute it stopped breathing. I took it out of the tank and put it into a cup just to make sure it was still alive. It was definitely dead. I opened its mouth with some tweezers and and held it upside down and a some sand fell out! I'm so mad!
I did everything right to build my reef tank and now my fish chokes to death from sand! The other one is doing fine and swims around more often. So I thought I just would've shared this story. Btw my parameters are just fine. Nitrates under 10.