I saved him.

[freespool]

I was doing water changes on on my tanks today and decided to be nice and do a water change on my wife's tank. she has a 5 gal with a one eyed fancy goldfish named "Willie" and a small cory cat. I did about a 50% water change. I usually just use a large cup to remove some water, but this time I decided to siphon the gravel. About an hour and a half later while cooking diner she yells at me that her fish are dead. I looked at the tank and the cory was dead and Willie was gasping on the surface. I immediately knew I screwed up. Poured in half a cap of PRIME and started to use a cup to oxygenate the water. After a few minutes I remembered I had some ammonia remover granules in a bin of fish stuff, so I put them in a small net and hung it in the tank. Continued to poor water from the tank over the net and oxygenate for about 20 min. It has now been about 3 hours and Willie is swimming good.

Thanks to previous threads I had the knowledge to know what was wrong and calculate an idea of how to fix it. Thanks HFB

[Enin]

how did changing some water cause that? I thought corys were catfish that could live in horrible water conditions. Did you not use declorinator?

[freespool]

I think it was a combo of mixing up the gravel to release stored ammonia and only used a drop of PRIME for the initial water change.

[fshfrk]

Yea that happens with gravel. Switch to sand and it will not happen near as bad. Just run your fingers through it or a pc of pvc. just stir it up a little. I do 1/2 of the tank every w/c. Good thing you did not kill Momas baby.

[freespool]

Still swimming, I think he may make it. I am trying to convince her to let me switch her tank out for a Fluval Edge or bigger. I think it would look good in her class room.