Hi Bro, getting a small or big one, heat will be generated. If the ventilation is poor, it will affect the lifespan of the chiller. Breaking down of chiller can always get a replacement but if it crashes yr tank, you will be sad. Maybe you can create fans within your cabinet to cool the chiller. With this, you may need external controller to control both device. Just my limited knowledge and advice. Hope experienced reefer can provide you more solution. : )