I wouldn't let a bad batch get you down, happens to all types of fish.
Have had 5 pearlscales for awhile, the golf ball type, and they are quite fun to watch.
Only special care we give them is feeding de-shelled peas a couple times a week - cleans them out, but peas are a staple for most of our fish.
Also soak their food in water before giving it to them, even flakes, so the food sinks and they don't gulp in air while eating - don't know if that is an issue, but have heard someone mention it before.