and the evaporation was what i was worried about when designing. since these fans are so high powered i wanted the evaporation to occur in the sump/fuge area and not from the display tank simply because i didnt want saltcreep in the canopy to mess with all the glass covering the mh. i wanted as much light as possible to go through for better efficiency.

thanks for the replies all, youve put my worries to rest, and ill be sure to take lots of pics tomorrow during construction!

-steve