I'm mulling a few ideas for a new rack in our fish room. Here is the space:
Black lines denote walls and existing racks. Red dashed lines for reference.
Here are a few pictures of the space:

The original plan was 2x 75g below and 3x 40g breeder above. We've decided we don't need the 40g tanks, but we could use some bigger tanks. To accomplish this, I'm leaning strongly toward altering the HVAC to gain some height. I *should* be able to get around 6 ft of height along the wall by moving HVAC. Max tank width into the room is 2'. Max length with a 2' wide tank is 4' (tank has to come into the basement through a tight corner). Max length with 18" width is 6', MAYBE (tank going down the stairs from first floor). I'm much more confident we could squeeze a 5' 120g into the room than a 6' 125g.
With the space and these requirements in mind, how would you fill this space?
More details on our fish room here: https://www.monsterfishkeepers.com/...d-bichir-girls-fish-room.580958/#post-6896349
Black lines denote walls and existing racks. Red dashed lines for reference.
Here are a few pictures of the space:

The original plan was 2x 75g below and 3x 40g breeder above. We've decided we don't need the 40g tanks, but we could use some bigger tanks. To accomplish this, I'm leaning strongly toward altering the HVAC to gain some height. I *should* be able to get around 6 ft of height along the wall by moving HVAC. Max tank width into the room is 2'. Max length with a 2' wide tank is 4' (tank has to come into the basement through a tight corner). Max length with 18" width is 6', MAYBE (tank going down the stairs from first floor). I'm much more confident we could squeeze a 5' 120g into the room than a 6' 125g.
With the space and these requirements in mind, how would you fill this space?
More details on our fish room here: https://www.monsterfishkeepers.com/...d-bichir-girls-fish-room.580958/#post-6896349