Ok, everyone. The 75g conversion from freshwater to saltwater has FINALLY begun. The tank is now empty, and my husband plans on building the stand this week, as long as he doesn't get called in to work. Its tempered glass all around, so no sump. I'll be running a canister and a Tidal 110. I've almost decided on ViparSpectra 165w (2 of them) for lights. I'm waiting to hear back from TBS to see about one of their live rock packages. If I can't get it from them, I'll get it from KP. It occurred to me that I haven't made a plan as far as powerheads. My 29g has an IceCap 1k gyre, and I really like it, but I don't know if a gyre would be the best option for the 75. Can I get you're thoughts on that, please?