The fish were poisoned.. What changes have been happening at your home.. Have you been painting, sprayed for roaches.. Blah blah.. think outside the tank.. Has your water smelled funny recently?
Gar are air breathers it has nothing to do with Oxygen so let's kill that...
I live in a apartment complex. So, anything that happens outside of my apartment is beyond me. I am just as clueless there, as you are.
however, I also have a 55 gallon tank and a 10 gallon grow out tank. I do all the water changes, the same way in all 3 tanks, at the same time. Not a single fish has died in my other two tanks.
currently in my 10 gallon, I have a 5" silver that I grew from a egg sack. He is as healthy as they come. I also have a 5" red tail shovel nose in there. Also healthy but he randomly lost a eye one day.
I would think if it was infact my tap water, wouldnt these be the most "liable" to go? considering they are young and not as resilient?
uploading video now.