Tank crashed

M

MKurpicski

New member
Well I just learned a hard lesson in USE A QUARANTINE TANK... Added some new fish to my well established tank the week before Christmas and last week I woke up to 1/2 the fish in my tank dead overnight and the rest steady dropping over the last few days. All water parameters show no signs of what happened and I am sure nobody introduced chemicals to the tank. I can't figure out what happened since everyone was active and eating well when I went to bed so still don't know the cause.

PH 8.0 - Little low but may have been the Rally treatments when new fish went in.
Nitrite - 0
Ammonia - 0
Nitrates - 5-10ppm
Salinity - 1.024-1.025
temp - ~74

1 fish left and he is just barely moving around the tank so the question becomes now what. :headwalls:

RIP
5 Blue Chromis
1 Yellow Tang
1 Zebra stripe Damsel
1 Yellow tail Damsel
1 Angelfish
1 Cinnamon clown, the other will likely be dead by EOD
 
Last edited:
I'm going to go out on a limb here, but adding a few new fish wont kill half your fish overnight..... Unless of course those new fish had Ebola.
 
Plus... A bunch of the killed fish were damsels.... something must have gone seriously wrong for the damsels to die. Check for some kind of equipment failure... dead heater, stray voltage.... something...
 
Outside of the snails & shrimp which seem unaffected this is the only tank inhabitant left...

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When was your last water change?

Maybe bacterial infection? Reading through your post again, I didn't realize it took a while for the fish to die. FYI, if you're looking for serious answers try the fish disease treatment forum instead of the lounge.
 
Been about a month since last water change, overnight I lost the chromis, angel & damsel, the others have been dropping steady since.
 
On a more serious note, looks like those fish are in a lot of trouble. You may want to quarantine what you have left living or else medicate the tank entire tank depending on what corals are in the tank. If it's a fish only you may want to use copper but that will sacrifice the entire tank. Or else sacrifice and start all over.
 
he is the only fish left in the tank, I don't want to use copper because while I have no corals now I want them later once I get sufficient light.
 
Tigerdragon said:
Looks like velvet
Click to expand...

Gunna go with velvet on this too. Fits the timeline and with everyone just suddenly being dead it seems like a heavy hitter like velvet. OP said he added the fish before christmas and if the store he got them from was running a non theraputic level of copper, 3-4 weeks woud be the time they would start showing symptoms, and thats about where he's at.
 
So if I decide to bring the tank up again what do I need to do to get rid of that before I risk any additional livestock?

mk
 
Looks like velvet to me also but you might want to post these pictures in the disease forum to get confirmation. I cheated my normal qt proceedure by a few weeks with one fish and lost half of my fish to velvet in about two weeks. I pulled my remaining fish and let my display go fallow for three months and treated the survivors in a sepetate tank with chloroquine phosphate. Copper would be your other option. There are several threads in the disease forum that you should read through.
 
What fish did you add that introduced the velvet? Maybe you can use the fallow period to get started with some corals. Too bad. Good luck on getting everything going again.
 
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