Cichlid Cave Hotel

I wanted buildings for my Cichlid tank instead of caves.
It is stack-able, add can add as many stories as you want.
Each story has 2 individual rooms per floor with windows and exit/entry points in each.
The roof/penthouse is a larger single room with vent holes in the floor for water circulation and a large access in the top.
Each floor is 5" x 4" x 2.5" high with base being 5" x 5" x 2.5"
I printed it at 70% or more infill to remove as much air as I could so it wouldn't float.
When printed base down (I don't know how to rotate the stl before I uploaded), no Supports were necessary for my print.

**EDIT** Converted roof scale to inches