More details can be found here:
Gall et al. (2017). Planktotrons: A novel indoor mesocosm facility for aquatic biodiversity and food web research. Limnology and Oceanography: Methods 15, 663-677. doi: 10.1002/lom3.10196

Temperature can be programmed from 3-30°C for constant temperature, higher for heat wave simulations

The experimental facility consists of 12 indoor mesocosms, so-called Planktotrons. They are custom-tailored units built of stainless steel, developed and established at the University of Oldenburg, Institute for Chemistry and Biology of the Marine Environment (ICBM) in Wilhelmshaven.