On Sat, 28 Jun 2014 19:59:04 +0000 (UTC), "DannyD."
wrote in

I am positive that almost every house here has BIGGER
and MORE tanks than I do, but, I just looked at mine,
and I seem to have only a puny 5,000 gallons!

Calculate the volume of your tanks here

http://www.aqua-calc.com/calculate/volume-cylinder

use feet (not inches) and multiple the vol by 7.5 to give you gallons.
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