Athosanswered grow question 7 years ago Also, you already mention that the water in the bucket is hot an smelly. Unless you can lower the water temperature significantly (below 20°C - 68°F), you are going to have root rot. You could consider using soil less media like coco. But if you want to continue with DWC, I've seen people using coolers adapted for DWC, their ability to keep things inside at lower temperature helps along with ice pack gels, if you can go around changing them over and over.
A few general tips, the ballast puts out a lot of heat (usually), don't put them inside the tent and if you can have a fan directed to it, it will help.
If you can, don't vent the hot air to the room, but to the outside.