Poor guy looks like he's going to die any second now.
Yesterday he spent the entire day on his side in a cave, today he wouldn't even eat the food when it was right in front it him.
And he's in a very poor shape, having trouble swimming upright, flips on his side often.
Improvement in the other bigger skinny loach though, eats bloodworms like normal today, bought some new bloodworms today that might made the difference, it's the much thicker type and looks to be better quality.