Hello,
Can you review your tank setup, such as the type/brand of UVB, temperatures, supplements,
etc so we can be sure it is all correct.
We normally don't recommend pinkies since some tend to have trouble digesting & passing
them. It sounds like he might have had some trouble, so I would feed soft foods right now,
until the stool can normalize. You can give some softer foods like squash baby food, sweet
potato baby food, or pumpkin (no spice or sugar) baby food, mixed with a drop or two of olive
or coconut oil to help soften up the stool & urates some.
If the blood continues, I would get a fecal done on him to be sure there isn't any high counts
of worms or parasites that are affecting his system.
Tracie