Marcus Fox wrote:
Is it possible to have a 5' x 2' x 2' aquarium on the upper floor of a two
storey building with no extra floor support? Doing the maths says that it
will exceed by a long way the 1.5kN per sq/m in the building regs, as works
out at about 600kg over 10 sq ft (0.92 sq m) but I have a feeling it's not
that simple.

If you made a 2.5m*1.6m plinth, then that would get you below
1.5kN/m^2