aquarium weight and the floor

Does anyone really know how big of an aquarium a floor can hold...My house is old was built in 1955 and doesnt have cement floors...im not a carpenter but have always been told the lumber back then was alot stronger then it is today...My floor isnt perfectly level but that dont meen its not strong but im still to afraid to go over a 55 gallon aquarium though i really want to....

It depends on the construction of of the floor joist of your home. Best way to find out is have it surveyed by a certified home builder.

Can you get under the house?

My house was built in 1970 . I have a 150 gallon along the wall in the 2nd bedroom / fishroom . in that room I also have a 50 long and a 55 stacked , and on another wall is a 75 . I feel that as long as I keep them along a load bearing wall , I'm ok .
Ray

if you can get under the house you can always brace the floor from underneath. I lived in an old house built in the 40's and had a 90g with 30g sump which is about 1000lbs with just water. All I did was go under the house and brace the floor where the tank was going to set. This was just as a safety precaution.

yea i can get under the house and add some bracing...dont think i need to with a 55 but anything larger i prob should

I added bracing under the LR where I have a 250 gal tank/pond.