tank talk

I'm new to keeping an octopus and would like any constructive feedback on my set up that I can get from those with experience. Here's the set up: 75 gallon glass tank with lid 1600 GPH external overflow box Trigger Systems 34" Platinum Sump Coral Vue AC20287 Protein Skimmer Current USA 1900...

Everything is finalized! My tank is being made and installed in approximately 3 weeks time. My question is about cycling. Typically I understand you have to cycle your tank for 3 months to provide the best water conditions for your octo. I told this information to the owner of the aquarium shop...