Actually I'm forgetting to share all my plans I guess. I don't even plan to insulate the walls I've built so far. The fish room and the coridor behind the tank will just be drywalled. I want this sealed area to be like a cold-room for some free tank cooling. I should also note that the fishroom wall is a shared wall with the condo next to us. The coridor behind the tank is however exterior wall. I plan to insulate that exterior wall once it extends past the end of the tank as that will be my office. I will most likely do the poly with slits like you have recommended. Thanks!
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