The Puffer Forum

Hello, until last week I used to have a brackish water tank with 3 mature silver scat, 3 mature argentus mono, 2 green spoted puffer, 2 small green scat and one 5" eigth figure puffer that been introduced two weeks ago. Last week the eigth figure puffer dissapear and that morning appear a few of vomit spots on the floor. I have two cats that never have attacked any of my fish tanks, but always can be the first time. Then, two days latter, two monos appear dead inside the tank with no cat attack signs. Yesterday one of the silver scats dead and one of the green scat almost like. I proceeded to make 75% of water change, but in the middle of it, the green scat died. After the water change, the left two silver scat, the mono, the green scat and the two green puffer looked good, but this morning I found just one silver, one green scat and the two puffer alive. I wonder if may be one of my cat hurt the puffer inside the tank and make it free some poisson that killed the other fish, but is no harmful for the other puffer fish. What do you think? Thank you for reading and your comments.

It is highly improbable. How did you cycle this tank? How large is it? Water parameters?
Moving this post to the Hospital Forum, so you can answer ALL the Qs above, in red.