It took my son about 25 min to catch the livestock: 10 discus (4-5 inches), 11 clown loaches, 10 roseline sharks, 10 Cardinal tetras & 5 plecos. I removed all plants & driftwoods prior. As I stated previously, the first one died after 20 minutes and the last one died after the 2 hr mark in the holding bin.Still, you had an airstone in there, that is a mystery for sure, how long were they in the drum and how long did it take your son to catch them?
Yes, I had the air stone in there before the fishes went in. I used a big air stone with a strong pump too. These roseline sharks originated from fast moving water high in oxygen as stated Drstrangelove. They weren't exactly gasping for air when dying...some were found dead at the bottom of the bin.