Also looking to get a neptune apex very soon I believe that my sumps are too small for both my tanks. Only 39 inch 1 has a refugium 1 does not. The fish only has the fuge. Need 1 for the reef tank for sure to help with PH and filtration. My LFS is 200 miles away in each direction and think that they gave me the wrong information on how big the sump should be. I have a xxl-750 red sea reef aquarium that is 160 gallon display not included the sump. I also have a marine land 210 system not including the sump this is fish only. I question the same size sump for both sizes of tank. By the way red sea had a sump included that cracked within the first couple weeks of owning. The top off slipped off the rail as I filled with a plastic bowl. They refused to replace it. Wanted me to buy a brand new one for 500 buck this is when I went to acrylic only sumps disappointed for sure in the response I got to a flaw I discovered. When the sump had water it bowed allowing the top off to fall off the rail cracking ( severely the sump) beyond use.Nice corals and looks like a great set up. I can understand the future upgrades.