I think I over reacted to be honest and she's doing good now. I do sometimes hear her breathing / hissing but I've been told that's nothing to worry about. I also heard a strange sound from her upper body when handling her but this has now gone since I made some changes. Her skin seems more supple too. I think these issues weren't present before because she stayed in the warm side but she's getting bigger now. The good thing is that my worry pushed me to make some changes for the better.
So what I did was remove everything, clean and disinfect it and put her on newspaper for a day with no added humidity. Then the next day I went to the local reptile store and bought a new heating system.
Basically in the UK we mainly use CHEs to heat our enclosures. There's a brand over here called White Python which is where I got my original one from. It looks stylish but in reality it doesn't perform as well as other more traditional types.
The problem is that it's designed to direct heat downwards to be more efficient but it doesn't radiate heat sideways so there's no real thermal gradient.
It created a hot spot and then room temperature everywhere else. So I bought an Arcadia system and installed it yesterday. This system radiates in all directions so it warms the air in the whole cage and has raised the cold side temp.
My temps used to be a hot spot of 91 and the rest of the cage at 75. The ambient air was room temperature.
Now it's a hot spot of 91, a cold side of 82 and a nice gradient in between.
In the pictures you can see the old green White Python guard and the new Arcadia guard. The new one looks less aesthetic but it's better for her which trumps everything else. I also simplified the cage.
I think White Python have over engineered that product and tried to reinvent the wheel but it hasn't worked well. Just goes to show that marketing and a shiny product aren't always the best.
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