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Can you keep the temperature stable? let's say 15 degrees Celcius?
Too cold and your tube will die too: below 10 degrees Celcius you wil get condensation, the difference in temperature will be too big so you might crack the tube.
To save a lot of problems you should just buy a decent cooler like the CW5000 or even the CW5200.
It costs a few more dollars but it assures you a longer life for your tube.
First i tried to keep my tube cold with radiators, ventilators, about 500W peltiers etc etc: in about a half year i wasted my tube... Then i bought a CW5000 water chiller, programmed it to 15 degrees and my tube lives for over 3 years now, excuse.. 4 years already.. No need for an extra waterpump, flowsensor etc.: it all in there and you can use its error signal direct to your controller.

But ofcourse you're free to experiment.. it's not my tube..

Kees

Is the CW5000 model what people are usually using btw? Why did you go for that model specifically?

I think the CW5000 is one of the most sold active cooler.. forgive me if i'm wrong.
Why a CW5000 ?? there are a few others, but most of them are quite expensive and this one is easily obtainable everywhere for a decent price.
Kees