i seen the thread about the large tanks on wooden floors the other day. well i have a large tank 180gal which i am thinking of putting on a wooden floor what do you guys think??/
I have a 135, and I have a crawl space under my house. I put a floor jack under it just to be sure, but I really don't think I needed it. I don't know my joist size, but the house was built in '76 if anyone would have an idea. You will have better luck against a wall, preferably an outer wall.
I think personally if the tank is leveled properly and it isn't over 210 gallons no one should have anything to worry about. If your that worried about it, get about 5 people to stand as close together as possible and jump up and down and if it collapses...lol I guess you couldn't put the tank there, but I'm sure it would be fine just check what you have underneath where you plan to put the tank, a joist or a support next to a wall would be best to not worry, but I dont think you should have to worry.
If your joists can hold a bath full of water you should be OK. The weight of the walls and roof are partly supported also so unless its a really big tank 350+ I dont think there should be a problem.