Massive Die-Off

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gouramiguy

Feeder Fish
MFK Member
Sep 23, 2005
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Indianapolis
I have a 75-gallon tank with brackish (now marine) species. I came home last night to find my target fish dead on the bottom of the tank. I tested the water and found extremely high nitrates (due to the dead fish?) I did a 25% water change and came home tonight to find all my other fish (2 large monos, 1 damsel and a pair of squirrelfish) all dead just like the target fish.

The only abnormality with the water is a lower Ph (nitrite and ammonia were zero, nitrates were a little high tonight but not of fthe chart). I recently upgraded from a smaller canister and emperor HOB filter to a Fluval 405 (about two weeks ago). Could it be that the filter wasn't ready to accommodate the bioload of the tank?

I did a water change on Monday and everything looked fine. My only other thought (besides the changing of the filter) is that the water is somehow contaminated? Not sure how to test for that.

Help!
 
No, they all looked great. I was really shocked yesterday. After I did the water change last night, the nitrate level was much lower and everyone seemed to be doing fine; I just figured the target fish's death was an isolated incident but clearly not.
 
I am Sorry to hear that I know your pain 5 weeks ago I had an outbreak of what we believe was velvet wipe out my whole tank my Clown Trigger went day one first my niger trigger, Domino Damsel, Striped Damsel, Yellow Tail Damsel and my Volatin Lion sad times But strikingly odd with no signs
 
ace869;4882772; said:
I am Sorry to hear that I know your pain 5 weeks ago I had an outbreak of what we believe was velvet wipe out my niger trigger, Domino Damsel, Striped Damsel, Yellow Tail Damsel and my Volatin Lion sad times But strikingly odd with no signs
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Did you do anything special before you re-stocked your tank? I've still got live rock and lots of snails/hermit crabs but don't want to add fish if there's something going on in the water.
 
gouramiguy;4882787; said:
Did you do anything special before you re-stocked your tank? I've still got live rock and lots of snails/hermit crabs but don't want to add fish if there's something going on in the water.
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The velvet can only live with a host with out one it goes away in 7 to 10 days I waited 21 days to begin restocking then put one fish in last Saturday and the second in that tank today.

I put two others in my Quarantine tank today and will put one in next Saturday and the other a week later
 
ace869;4882831; said:
The velvet can only live with a host with out one it goes away in 7 to 10 days I waited 21 days to begin restocking then put one fish in last Saturday and the second in that tank today.

I put two others in my Quarantine tank today and will put one in next Saturday and the other a week later
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Thanks for the info! Is there any way to tell if that is what I had going on in my tank? best of luck with your new fish!
 
Mine had fraying on the fins had the velvet look to there skin as well as filmed over eyes and really labored to live the day before they died so the showed the signs yours does not sound that way
 
i just read that you can check for Velvet by turning off the room lights and leaving the tank lights on if the fish has a velvet looking cover on its gills then its velvet lol
 
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