Ive been reading and it says that if they can get established in the tank there are pretty hardy. But what makes them so "delicate" is that they dont ship very well and dont acclimate well either.
They are pretty hardy in a larger mature tank. I'd say 75 gallons per Lynkia. Another thing that do them in is being exposed to air. And, I recommend an extended acclimation, 2 - 3 hours.
Sometimes they will sit in the same spot and not move a muscle for a whole day. Usually if they stop moving it means it's full or it found something to eat. Give it a few days to get established.
3. They require a very large, very well-established tank. They pretty much consume only bacterial film, and almost never take to supplemental feeding. This film only builds to a sustainable level after the tank has been established for some time.
4. They require long, slow drip acclimations. Around 6 hours has been suggested.