Well i found this posted on Craigslist but figured its worth a share and may help someone out there.

AQUARIUM GALLON CAPACITY GUIDE -- LENGTH X FRONT TO BACK X HEIGHT IN INCHES -- USE TO FIGURE OUT TANK GALLON CAPACITY


2 gal Explorer 11x6x11

2.5 gal 12x8x10

2.5 gal Minibow 11x7x14

3 Eclipse 12x7x11

5 gal Corner Eclipse 12x10x15

5 gal Hexagon Eclipse 12x12x15

5 gal Mini Bow 15x9x14

5.5 gal 16x8x10

6 Eclipse 16x8x15

8 gal BioCube 13x13x14.5

10 gal 20x10x12

10 Hexagon 12x14x18

12 Eclipse 20x12x18

14 Hexagon 13x13x14.5

14 gal BioCube 14x14x14

15 gal 24x12x12

16 Bowfront 20x13x18

20 High 24x12x16

20 Long 30x12x12

20 Tall 20x10x24

20 Hexagon 18x16x20

23 Flatback Hexagon 24x12x14

25 gal Cube 18x18x18

26 Bowfront 24x15x21

27 Hexagon 18x20x25

28 Bowfront 24x16x18

29 gal 30x12x18

29 gal BioCube 20x20x18

30 long 36x12x16

30 Tall 24x12x24

30 Breeder 30x18" 30x18x13

30 Breeder 36x18" 36x18x12

33 Flatback Hexagon 36x12x16

33 Long 48x13x12

35 Hexagon 23x20x24

36 Bowfront 30x15x21

36 Corner Bowfront 34x24x21

37 tall 30x12x25

37 Column tank 20x18x25

40 Tall 36x12x21

40 Long 48x13x16

40 Breeder 36x18x16

44 Pentagon 22x22x24

45 tall 36x12x24

45 Tech Tank 24x18x25

45 gal Cube 24x24x18

46 bowfront 36x15x20

47 Column tank 20x18x30

50 Breeder 36x18x18

52 Flatback Hexagon 48x13x20

54 Corner Bowfront 28x27x22

55 gal 48x13x20

56 Column 30x18x24

57 gallon 36x18x20

60 Tall 48x13x24

60 Hexagon 22x22x31

60 gal Cube 24x24x24

65 gal 36x18x25

70 Corner Bowfront 48x22x25

70 gal Cube 30x30x18

72 Bowfront 48x18x22

75 gal 48x18x20

76 Half-circle 45x23x25

85.6 gal 72x13x17

90 gal 48x18x24

90 Surfline 48x20x25

92 Bowfront Corner 48x34x24

93 gal Cube 30x30x24

95 Wave 48x24x25

110 tall 48x18x30

120 wide 48x24x24

120 long 60x18x26

120 gal Tech tank 48x24x25

125 gal 72x18x22

144 Half-circle 57x29x29

150 gal long 72x18x28

150 high 48x24x30

155 Bowfront 72x24x24

180 long 72x24x24

200 Deep Dimensions 48x36x27

210 gal 72x24x29

220 high 72x24x30

250 Deep Dimensions 60x36x27

265 gal 84x24x30

300 Deep Dimensions 72x36x27

Also, here are a few oddball sizes

210 gal 84x24x24

300 gal 96x24x30

300 gal 96x30x24