Originally Posted by
Bethzb
Quite possibly ammonia. All parameters are fine now though there is still about 5ppm nitrate which is very unusual for this tank. Today is water change day anyway so I'll attempt to check under the driftwood for bodies. Since this tank is roughly 15 years old I'd think any ammonia would be broken down very quickly. That and there is very little bio-load. I just assumed nitrate since that is the only reading I've got right now. Of course, since it is an old dirt bottom tank there could be all kinds of gaseous goodies in the lower levels of the soil. Perhaps the cory's dislodged something. Also seems strange that only the angels were affected.
Stock left is 2 angelfish, 4 flagfish, a dozen endler's, and maybe a cory or 2 in a 75 gallon tank. I don't see any octo's anywhere and I don't see any cory's. Unfortunately, I did not quarantine. My normal methods are to put the little things in first, then add whatever my "prize/show" fish will be. Ah well. Took a chance and paid with a 7 year old fish along with a 3 year old.