Tiger (Tigrigobius macrodon) mysteriously dies?

Micro-Reefs Aquarium

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I am perplexed that after seeing all my 5 fish eat frozen brine, I came back to my aquarium 1 hour later to see my goby is upside down next to my green banded goby.

All other 4 fish are doing fine.

The only thing I added were two tiny brittle stars that came in with my new live rock for my other system.

The tiger goby ran up to the brittle star and bite him and spit him out.

Could that have caused something?

My fish have been in my 12 gallon tank for 2-3 months now.

Here are the pics of him.

20210713_195137.jpg 20210713_195132.jpg 20210713_194933.jpg
 

WHAT’S USUALLY THE FIRST CLUE THAT SOMETHING IS OFF IN YOUR REEF?

  • A fish’s behavior or appetite changes

    Votes: 12 15.8%
  • A coral looks different or stops opening normally

    Votes: 46 60.5%
  • Water clarity or surface appearance changes

    Votes: 11 14.5%
  • Equipment sounds or flow seem different

    Votes: 8 10.5%
  • A test result catches my attention

    Votes: 16 21.1%
  • Algae or other growth starts changing

    Votes: 15 19.7%
  • I usually notice when the problem is already obvious

    Votes: 4 5.3%
  • It depends on what’s going on

    Votes: 16 21.1%
  • Other (Post in the comments)

    Votes: 1 1.3%
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