I don't know if our local Tractor Supply store has it in stock, but if they do, I could measure it sometime this week if I go to town.
Also, I have 100 gallon stocktanks that are empty and I could measure the bottoms of them, and maybe you could make some guesses about the decrease in size of the bottom of the 150 gallon?

Thank you very much for the help. I was about to post that I opted to just order this 300 gall stock tank as had the dimensions I wanted.

http://www.plastic-mart.com/class.php?item=104

Place I went to today will order it for me and deliver as I have a car and though a convertible holding on to this while driving will look like something from an inspector clouseau movie .

I have an adult pair of jag cichlids but this will give them just that much more room and can put a few pots with cattails and papyrus .

Are all your stock tanks rubbermaid , are they for actual animals or ponds ? I ask as seems those are the most popular types in this forum .

I have a neighbor with zebu but they use those steel type stock tanks.

http://img256.imageshack.us/i/zebu.jpg/

Thanks again

Meant Dempsey not Jag .

LOL about the image of you with it in your convertible! Don't fly away!
All my stocktanks are Rubbermaid. I have 4 300 gallon ones, but just for plants, no fish.
I think the one you are getting is more round than the Rubbermaid ones, which will probably give the fish a better swim area.
Good luck!

Thank you. Rubbermaid certainly is well made . Wish they came in more sizes for fish keepers.