5 dead overnight

marks69

marks69

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Feb 7, 2004
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hi all.
the tank is a 65g, set up since christmas.the water is at 79, ammonia 0, nitrite 0-.25, nitrate 10.
never lost a fish in the tank till last night.did a water change at dinner, and they were fine, doing the shaking mating dance right till i went to bed at 2.
this morning 1 large acie, 2 yellow labs, and 2 p soulsi are dead(mabye a 3rd, i can't find him).the p soulsi were added yesterday from a very good fish store.
this morning i did a 30g water change and treated with 2x prime, but 1 acie is really having trouble, she sit's in one spot for about 10 minutes, then get's up and thrashes around for a bit, then goes and sits back down.
all of the dead fish looked like their jaws were stuck wide open, and 3 were floating.
thanks all
mark
ps i changed about 40 out of my 90 last night and they are all fine, so i don't think it was the water.
 
With their jaws wide open, it sounds like a lack of dissolved oxygen. You mention you added some fish to the tank, did the problems occur after this? If so, perhaps their was simply not enough oxgen in the tank, and if the tank is planted, these oxygen levels will drop even further at night while the plants respirate. The easiest way to solve this problem is simply good aeration, which can normally be achieved with a reasonably powerful filter.
 
don't think that's it.i had changed about 25-30g last night, and the 404 is pushing the water surface pretty well.also, none of the other fish are near the water's surface.there's only a few plants in the tank, and their mostly eaten(gotta luv these guys.lol)
thanks
 
It sounds like it was either the water change or the new fish added. But since you said you changed your 90 last night as well, i doubt it was the water. HOWEVER, did you clean the filters? Did you forget to plug back in the filter? Did you let the media dry out during the water change? All these can have serious effects on the fish.

Also, its bad to be reading nitrites. Nitrites are just as deadly as ammonia, and this is showing that your tank is not fully cycled yet (which is strange if it has been set up since christmas). How many fish did you add yesterday? If you added a lot of fish then it could have sent the tank into another cycle and shocked the fish.

Another possibility is that there was something bad brought into your tank from the new fish (this is why its best to qaurantine). It is strange it would affect the tank so fast though.


HTH
-Diana
 
i didn't touch the filters last night. just a quick water change.the 3 fish were about 1" each and that shouldn't have effect this quickly.i also moved a bala shark out of this tank last night(he got beaten up in the tropical tank) so the bio level was about the same.the nitrite could have been up a touch(blue with a hint of purple) but not that much.i also use prime for declor, which should take care of that.today the last large acie in the tank is either sitting on the bottom, or swimming in place at a 45 degree angle, but she doesn't loak bloated, has no marks on her.last night she was ready to breed.

thanks
mark
 
usually cichlid attack in the evening, with a touch of flake.not alot and it's usually gone in about 4 minutes.i use the flakes because some of the younger fish can't get the pellets before there gone.
 
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