Think you hit the nail on the head. Checked with my "expert" this morning and he said toxic gas release.
I do use PRIME always - best thing out there I've found for dealing with our tap water. Have been thinking about investing in a reverse osmosis filter because of the crappy quality of our water.
Am definitely going to do the reverse flow powerheads, excellent suggestion!
Guess this one falls under the heading of "I knew better but I did/didn't do it anyway." Dumb, dumb, dumb. I've read a hundred times NOT to break down the whole tank at one time to clean it and I did it anyway. Probably not as bad as "my laziness killed 2 of my fish." Now if you could tell me WHY people do dumb things when they KNOW better *sigh* ...
Thank you for all your help and advice. Now if I just can get rid of that sick feeling in the pit of my stomach that tells me I've REALLY screwed up ...
Making perhaps dumb mistakes is a human quality shared by many , myself included. Much of what I've learned in this hobby and in life, has been the hard way. Pleases me If I can help someone avoid problems with respect to keeping our wet pets.
The most important medication in your fish medicine cabinet is.. Clean water.