Looks Amazing.. Im almost at the same stage of my build.. Curious what you are doing fro Humidity mitigation ? what are you doing on the ceiling.. or are you leaving it exposed?
My fish room will be @ 400 square ft. I'm installing a Panasonic ERV (FV-04VE1) and an in-wall humidifier (Innovative Dehumidifier IW-25-4). I'm lining the walls with Azek panels ( PVC) . flooring will be (https://www.motorcityfloorsandcoatings.com/basement-concrete-coatings)
Nice setup.
For humidity control I am sticking to my method from the last system of minimize, contain, and mitigate. The sump tanks will all be covered with tops to minimize the amount of humidity getting into the fish room. I am going to cover the ceiling in 6mil plastic, walls of the finished part of the basement will be covered in FRP boards then sealed to contain moisture in the fish room. Then I am planning to get a whole house dehumidifier that is ducted with vents drawing from the displays, frag tank, and refugium tank canopies to create a negative pressure over those tanks. This will force the moist air to travel through the dehumidifier before it can go back into the fish room. While this is the initial plan it is subject to change based on humidity levels in the fish room and the rest of the house once everything is running.