What killed clowns? Velvet?

dhboiler

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Hi everyone, I'll apologize in advance for the length of this.
I am trying to figure out what went wrong with some fish recently. Back story. I had to downsize due to a move. For about 2 years I kept 4 fish together. An ocellaris clown, a spotted toby puffer, a redheaded goby, and a tailspot blenny. Again, these fish lived together 2 years with nothing new added, and no new corals added.
Over a period of about 4 months, both the goby and the blenny disappeared. Small fish, never found the bodies. Not really sure about that. One day they were there eating, one day they weren't.
Then a few months after that, my clownfish stopped eating. It would however go after food, but always spit it back out. It seemed to take just enough food to keep itself going. This went on for 2 weeks, the clown kept going, but started showing what I thought were signs of starvation. It never showed any outward signs of disease. No spots, no flashing. Just didn't want to eat. My spotted toby puffer showed none of the same issues. The clown and puffer had lived together for years in peace, and I never saw any continued signs of aggression. So a frag swap came up and a few days prior the clownfish had been showing signs of improvement. It was eating and started to look like it was gonna rebound. My plan had always been to try to introduce a new mate when I could pick one up at the swap, so I went ahead with it. I introduced the new clown and they took to each other quickly, very little aggression whatsoever. A day later the first clown relapsed. It's face and body looked shrunken, acted like it was struggling to breath. It died overnight. Within a week, the second clown did the same. Except, it went way quicker. One day it looked healthy, one day it looked shrunken and sick, and wouldn't eat. It died within 2 days.
I have been researching and I feel like it could be velvet, but I am just not sure. The puffer has never shown any signs of sickness and is still chugging along fine. It's just can't be a coincidence that I went from 4 to 1 fish in a period of 6 months after not losing a fish for 2 years. And how did it get there if it was disease. As I said, nothing new was introduced.
I guess my biggest question is, I am in the middle of an upgrade plan. When I move the coral, would it be smart to move the puffer to a QT tank and run fallow for a few months? And more importantly, what if anything, should I treat the puffer for? Thanks to anyone for taking the time to read and provide answers.
 
It could have been velvet but it might have also been Brook or something else entirely. Did any of the fish have small white dots appear on them or any other physical symptoms that you can remember?
 
None at all. I also wondered about a parasite. On the last days of the clownfish's lives, they looked shrunken and I forgot to mention their gills looked flared. Basically signs of labored breathing. And they were sluggish. The other two fish just plain disappeared.
 
#reefsquad, any thoughts?
 
Any fish still in the tank?
 
Just the spotted puffer. That is why I am wondering if he should be treated. I don't want to get my larger tank running and have fish start dropping dead again. Conversely, I don't want to put a fish through a QT and treatment if it isn't necessary.
 
None that I can really remember. I tried dosing prazipro, but it had no effect.

Prazipro would only treat external worms such as flukes, turbellarians. Dosing the water is not as effective against intestinal worms which are best eliminated via metronidazole laced food.
 
Interesting. Didn't know that. Truth is, I had barely anytime to act on the second fish. The first one just seemed like it starved itself to death. My gut tells me that I have something in the tank, and it likely needs to run fallow for awhile. I am just hesitant to put the puffer through a quarantine and treatment if it's not necessary.
 
I would run puffy in a QT just as observation.
Run tank fallow for at least 76 days but longer is better.
Mean while you can QT some new fish.
Make sure that equipment used for QT is all new or sterile.
 

IF YOU HAD TO TAKE A REEFING EXAM, WOULD YOU PASS?

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