well come to TRT.
you need to remove the glass hood , it does not help withhteh gas exchange you need on the tank. it will also trap the heat in.
can you post a picture of it?
if it is the one i am thinking of. they are sorta hard to keep alive, you will need to do a good direct feeding of it using phytoplankton , you may want to turn off all your filters and power heads ( cut off the flow) and feed every few days.
here is some reading that should help you along.
also watch for any alage that might try and grow on it!