Ok so this used to be my set up.
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The heat and uvb bulbs are


However, I've just changed my UVB bulb yesterday to an Exo Terra bulb cuz I guess its a better brand and I've been using the Arcadia for about 9 months. Hope that it would cure whatever they're having. (they're both basking now as I'm typing this

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So as for their tank, I do a full cleaning of the tank every 10 days (thrice a month) with a 50% water change every time.
I would then add some Aquarium Salt cuz its suppose to bring the hardness down and prevent fungus.
My turtles eat well and are pretty active.
I'd tried various medications for my turtles to try solving their shell problem but nothing works. .
- Azoo Anti-Fungus Treater (tired for a week, even the mildest-infected spot showed no slight changes)
- Betadine (tired for a week, even the mildest-infected spot showed no slight changes)
- Brushing shell with vinegar (if it were Mineral Deposit, no change as well)
So ExoTerra UVB bulb is pretty much my last resort. If it doesn't cure whatever they're having, then I'm not sure what else i can do. Maybe a vet?
Right now I'm hoping that its just Metabolic Bone Disease which can be cured by a good UVB light and cuttlebone.