Badfish, and goodbye to shrimp

Rasboras were fighting again today. One of them had some scale damage near the caudal fin, so it seemed like the fighting could be pretty serious. We identified one (two-stripe fish) who seemed to be a primary instigator, so we netted him out to put into solitary confinement (a plastic jar floating in the main tank).

As soon as we took him out, another fish seemed to take his role in terrorizing the other fish. We were getting ready to take him out when I found one of the shrimp (the lighter-colored one) lying dead on his side, which was quite a surprise because the shrimp have been out and about and growing quite large.

We immediately did a water test, and as I was waiting for the results (ammonia < 0.25 ppm, nitrate 10 ppm, phosphate 0.5 ppm) I hear a tiny splash and look up to see a guilty-looking rasbora at the surface of the water. He immediately darts for cover. Upon further inspection, the jail cell is empty! Yet another instance of jumping rasbora...this is why we have to keep the lid closed.