Now I have time so I can write here something too

...
I keep ants for long time and I had really huge colonies , not only in hundreats , but in huge thousands (F.polyctena 5k pop 20 queens ... C.vagus 1+2000 adult , M.rubra 8k+40 queens cca)... now I am hibernating and just making some formicariums and terariums for the another animals.
For terariums I am using cactuses (or aloe tylandsia and so) , but P.dives is tropical so you can use just plastic flowers specialized for terarium , or make this
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I see you put here much of fans , what power you using for it? ... some bought or like me - from PC

(350V). Heating is OK

, in my experience P.dives needs dry nest with a bit wet air , so humidity is not so important when you feed them with sugar water. But I see small light there ... maybe there is bigger light in room so it is not so good to see how much it shine. Better to use more powerful lights , because ants moderating their food huntng activity by it.
To get some place you have to use some roots , branches there

, you know every m2 is useful for ants , not only on ground.
S