their reay inbred and not as hardy as they used to be as their mass produced.
I agree that a lot of the 'popular' fish in the aquarium industry have been ruined by captive breeding on farms. Except for one of my oto species, all fish I've ever had have been wild-caught fish and I've never had issues with unexpected die-offs.
I helped a friend set up a 75 gallon tank and wanted a huge shoal of neon and cardinal tetras. He ordered 48 of each from an importer, and a group of 10 cories.
Tragically, my friend's house was damanged 4 months later in a hurricane, and was without power for weeks. He and I took all the plants out of the tank and spent nearly 5 hours with flashlights and nets catching the fish. We put them all in eight 5 gallon buckets of water with battery powered air pumps (used to keep bait fresh when fishing).
They spent the construction time in an empty 29gallon tank at my house. I used floating plants as a biofilter and a sponge filter from one of my tanks. I had to do daily 30% water changes at first.
Three weeks later, he drained all water from his tank, cleaned everything and started over. He spent a day and a half replanting (plants had lived in his backyard in a 'kiddy pool' for the duration).
Then I filled up the buckets again with his fish. We wanted to know how many had survived the ordeal (its hard to count that many fish in a huge planted tank anyway). 48 cardinal tetras, 48 neon tetras, 10 cory catfish.