Could this be 100 gals?

[Joeybsmooth]

I know is hard to tell with out any points of a reference.

I e-mailed the person selling to the dimensions, an have not got a rely .

 

[Sssea]

I would measure an electrical socket and use that for reference. If it's x inches in picture and y in real life, then x inches on the tank will be y in real life. You may be able to calculate the gallons from there. Obviously you cant calculate depth, but the length and height may help. Just an idea if they don't get back to you

 

[jcolon]

I'd say it's probably a 55 or 75E as I came up with about 48 inches wide. I had the same idea as Sssea's, outlet covers are about 3 inches wide and I measure about 16 outlet covers length wise.