You should name and give credit to the breeder here. That is a lot of insight and even I can't find any point to argue there. I agree. I also have taken to using little to know UV with hatchings. Babies simply don't need it, and as your breeder noted, they hide all day in the wild until they grow and put on some size.UPDATE: I spoke with our breeder, he agreed something strange was happening since the little one was very active before today—we went over the enclosure and all, and he recommended that we stop using the UVB light for a week.
He said: "It was a very strong healthy tortoise and my assumption will that it will bounce back quickly after the UVB gets absorbed by its body. These babies in the wild hardly see the sun long enough to even absorb the UVB. So they are not made to absorb synthetic UVB for long hours. That’s why i always suggest 1-3 hours. But if a tortoise us some issues after it’s been perfectly fine, it’s either they fed it something strange, too cool and damp at night, or it’s the UVB. 99% if the time, removing the UVB, fixes the issues. It’s like radiation, it builds and builds and the baby can absorb it quick enough and it starts to affect the organs. We aren’t even close to that stage yet. Usually happens after a month or so. But with a New uvb bulb, it could be strong levels of UVB. Too much is worse than not enough. I don’t even introduce UVB for the first two weeks of life."
Which makes sense to me.
So I was instructed to "kill the UVB. Don’t turn it on for a week. Sometimes too much UVB causes issues. Makes them lethargic. I would bring the soak down to 5-10 mins. Keep the heat lights on for 16 hours a day for the next week. But 95 should be the hottest. 100F is pretty hot. Sometimes too hot causes dehydration. Feed some romaine for the next two meals. It has a lot of water in it.
Sometimes those puffy eyes means too much UVB or cold and damp. I wouldn’t spray the enclosure. Instead, i wound pour a glass of warm water under the heat source.
I would also make a humid hide and place it under the heat source."
I asked if there was a way to help the little absorb the UVB and he said "Nothing you can do except soak. And offer food with high hydration like romaine. You need to flush it out. Takes about 48-72 hours. Also keep in mind that they go through growth spurts. And when they do that, they sleep more for 2-3 days. Keep me posted. Don’t panic unless it doesn’t eat for a week."
It made me feel a lot better and I trust my breeder—he's well-known and has been very helpful—I just wanted to put all of this here for others' input as well.
What type of UV bulb is it? You said slimline, but is that an HO type? 10.0 or 5.0? 7-9 inches away is VERY close. What size enclosure, and is there lots of "shade" and cover for the baby?