here is the sump after being in use. The skimmer is now at the manufacturer's recommended depth. when i first put it in, before it had broken in, i had to put plastic squares under it raising it 5 inches. this concerned me enough that I started to think of abandoning the 75 plan. The issues of humidity inside the stand, the cramped conditions, the height of the skimmer, carrying water upstairs, started me thinking of just having this system as my saltwater option. I found it pleasant to be able to focus on the saltwater in the basement with no other distractions like in the dining room.
At this time i was topping off by hand. Several times the pump blew micro-bubbles before I was aware that it needed water. The overflow worked ok and the overflow protection kept the floor dry. Over all the plans were working, But...
I have a friend with an AIO. That tank kept drawing me back to... So I told him of my reservations and that i wish i could deliver water to and from the basement. Over time I thought about it and wished I could put a sump in the basement but the sump would have problems with the amount of water in the plumbing and the pumps that I could find were not sufficient to lift the return water upstairs.,