I come up with about 36gal so 35gal's fairly accurate. Use the rectangular section, 20"Lx17"Wx20"H /231 = 29gal. The two roughly rectangular ends can merge to become another roughly box shape so 10"x8"x20"/ 231 = about 7gal.
Note I get 8 by subtracting 20 from 28 = 8 inches / 2 = 4inches per end.
75g Planted Barbs Denison, BlackRuby, Tiger, Albino Tiger, Green Tiger, Cherry, Gold, Checkered, Odessa.
NonBarbs Cardinal, Neon, RummyNose, Bloodfin Tetras, Z. Danios. 1RTS. Amano, Bamboo, Ghost & RCS. 20g Long Shrimp Tank RCS, Tiger, Amano.