Thanks for the replies and concerns.
The fixture takes a standard T8 18" 15 Watt bulb. It is in fact installed in a Bookshelf which limits airflow. It is in fact a Bookshelf Aquarium by design and marketed as such by Petco. 24 inches in length maybe 9 inches high and 8 inches deep. It does look awesome on a bookshelf.
I'm gonna go ahead an drill the hood for better ventilation. I am just disappointed after growing plants in it for over a year and having them do so well, that things could come to an end due to design issues of the hood.
Well thanks for letting me vent. Here is a pic for you viewing pleasure.