Holy cow 2 X 400W for a 77g tank is a lot! Unless you are upgrading to a bigger tank then ignore this. I'm sure you have thought of it but you will definately need to take heat into consideration. I have 3 X 400W over my 230g and need a fan blowing over the sump/fuge to control heat. A chiller is definately on my shopping list before next summer. My tank is 31" deep (can you say PITA for cleaning) and I still have to be careful how I place coral as it will easily bleach
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