I run a couple of 400w(and a couple of VHO antics) with a couple of hood fans and my canopy is fairly open (no glass on top of tank) and I still struggled with temp increase, 2- 3 deg by end of day, so ended up putting a small house fan over my sump - all set up with timers. Seems to be doing the job so far.
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Mike
150g reef, 55g sump, T5's, Vertech 200A, Profilux III - German made is highly over rated, should just say Gerpan made.
Reefkeeper - individual obsessed with placing disturbing amounts of electricity and seawater in close proximity for the purpose of maintaining live coral reef organisms.
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