To replace your current hood open up the unit approximately 4 inches and pop off the hood from the back hinges. This is very easy to do. It should take no more than 1 min. to replace the whole hood on your nano cube.
With the LED lighting that is offered with this top you will not need to use a chiller whereas if you had HQI lighting previously you probably had to use a chiller due to the amount of high heat those units put out. LED lighting produces almost no heat whatsoever for your aquarium.
Please remember we offer the best prices any price beat guarantee on all JBJ products.