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Man, cleaning a 3' High would be a PIA. From my armpit to my fingers is 2'-6" (I just measured), and I'm 6'-2". Doing simple geometry, to reach the middle of your tank:
Using Pythag's Theorum:
a^2 + b^2 = c^2
2'^2 + 3'^2 = c^2
13sf = c^2
c = 3.605'
c ~ 3'-7"
So if you were standing at your tank and wanted to reach the bottom of the tank in the middle, you would have to reach 3'-7" from your armpit to your finger tips.
Now, assuming a 4" DSB
a^2 + b^2 = c^2
2'^2 + 2.66667'^2 = c^2
11.111sf = c^2
c = 3.333'
c ~ 3'-4"