/cgi.ebay.co.uk/3x54W-T5-Lighting-ha...oQQcmdZViewItempros for a hood
less evaporation
holds your lighting, moonlights, etc
can match the stand, be stained
draws attention down towards the tank
keeps jumpers in the tank
pros for open top
easier maintenance
plants can grow up past the water surface
no hard water deposits or condensation