Update.

I want to be sure water dont stay in the bottom so i saw many holes. The only thing i need now is 2st T-connection for those tubes.

I also had to place some pvc pipes under false bottom thanks to the labyrinth pattern under the balcont floor were water could have stayed.

This may not look that good But it works to cool down the tank, T5 fluorescent lamp give some heat. I made it with 50mm cellplastic, but will cover all sides and the roof in same material as the vivarium so it looks better. The box is messured for a hammar plastic box 34x25x16cm lxwxh to fitt whit frozen water.
I have spend about 120euro on silicone so far and will need 2st more tubes.

Now i have carved two extra pot holes and cover the inside with silicon, i thought it might be a good ide if i have to take them out some day and not happen to skratch up foam inside. There are also insect net fixed for drainage.

Pond im working on, nothing special but it will look better then a water bowl, and i can easily empty it.

This litle plastic thing will aggregate dirt/subsrate that tigers might bring into the water.. I left some space for a cork/lid..

And the backgound poster. I have not got it printed yet but i hope it will turn out something like this
Regards.