WC after fish death?

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SePPii

SePPii

Dovii
MFK Member
May 21, 2011
3,373
371
107
Chesapeake, OH
I recently acquired 2 parrot fish whenever I bought my new tank. Yesterday I did a 50% WC and all was well. I came home last night and all the fish were good the parrots were being their normal selves swimming in circles around the tank looked perfectly fine. I went to bed at 2 o'clock and turned their lights off. My gf woke up this morning at 8 and only the 2 parrot fish were dead... No marks on them from being beat by another fish they were just sitting on the bottom of the tank. The tank mates are :
2 6-7" Bala Sharks
2 4" Severums
1- 2" tiger barb
1 4" angel fish
1 6" Syn lace cat
1- 6" BGK.

These are all in a 75 was temporary til I got the 225 running. But the parrots were by far the bulkiest fish in the tank. Anyway what my question was , should I do another WC since the dead fish sat in tank for 8 hours? The water looks a little cloudy... Thanks in advance.


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There could have been two reasons for this,
A)Prior to your water change the Ph was at or slightly below 7.0. Ammonia at 7.0 and less is known to be very non toxic its actually called Ammonium. By drastically increasing the Ph you may have converted your left over ammonium to toxic ammonia. @ 7.2 and higher free form ammonia is thee only type of ammonia since Ph reacts with the waste of the fish to produce quickly free form ammonia, A.K.A the bad stuff that will kill fish.

B)Nitrogen saturation or gas bubble. Usually happens when water is not aged prior to doing a massive water change. The gases in water have to be diffused because it can enter in to the fishes blood stream. Like the bends in divers,this happens internally.

C) did you use salt?
 
Didn't use salt, and I guess it could be either of the things you listed. But, why would it just kill the parrots and not the other fish?


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Balas are way more sensitive than parrots in my experience so would that have killed them off first? And I have been doing a weekly water change every Monday. And F1 VET I did use the dechlore and I matched the temperature fairly close to the temp in the tank. The first died nearly 12-16 hours after I did the water change


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Its a good thing you did not use salt,salt will kill fish by shutting down the kidneys,I work for a wild life org unless treating fish don't use it. Parrot fish are hybrids and hybrids tend to be less intolerant or less resistant than most fish. They are deformed its how they get their "shape".Hope this helps, does your city use chlorine, chloramines. Use amquel or prime if they use chloramines, it coverts Ammonia to ammonium....
 
One thing get a glass cup.Now fill it with cold water from the tap,put it at room temperature, wait an hr or two and then look. You will see the bubbles, this minor things are the stuff we don't see but it can kill your fish. I once lost alot of fish because of this and I could never explain it.
 
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