I have over 4000kg in a 3mx4m room: 10x 220 litre tanks 2x 375 litre tanks, 6x 150 litre tanks 4x 60 litre tanks full, plus racking + a few empty tanks.
The room is on wooden floor boards held up with joists and wooden stumps in the ground. This part of the house is over 100 years old. Granted it is ground floor, but still.
You will be fine.
P.S. I bet people have bookcases full of books which weigh more than a 40 gal
tank but no-one ever questions if that can go upstairs, they just do it and I have yet to hear about one falling through the floor.