aww..i like the water sound but thanks Nub hmmmm..where to get those rag-thingys
I also like the rain falling sound of the tower bong. The difference will only be a few C and less fan noise.
You did not say what your temperatures are currently with the tower? If your water temps are 3C to 5C below ambient - I would suggest just staying with that.
Sending pm re. bong construction.