Newb question on H20

How large of a resevoir will I need to flood my table? It's 8'X4' with 4 inch walls . As I understand the table needs to be flooded to about 1/3 and there will be a bunch of media in there . So I was planning on using a large rubbermaid tote (28 gallons), but if thats not gonna cut it, I'll likely attach two of them together side by side - I have height restrictions.

8'x'4 = 96"x48" = 384"^2 (384" squared)

and you want 4" high but only 1/3 the way up, so that's 4"x(1/3) = 1.32" high with water

so we take the tables surface times the height to find the aria, 384"x1.32" = 506.88"^3 (inches cubed for aria)

since gallons are about 231"^3 we can take 506.88"/231 = ~2.2 US Gallons. Not as much as you thought, eh?

so you will need enough water in your res to cover your water pump and then add 2.2 Gallons to that.

Thank you so much