Octagon tank volume?

[Bosemani Fan]

Ok, I got a new tank off of Freecycle today, It is an octagon Tank, But I am not sure how many Gal. It is It is 2' high, 17.5" deep and each glass panel is 10" wide. so how do I figure the volume?

:look:

 

[Black_Moor]

This didn't say if it was specifically for Rectangle or not, a formula to use to figure gallons..


Tank Formula : L x W x H = then divide by 231


since you have multiple panels I am not sure how you would do the math? .. 10" x 8? .. i'm getting Alzheimers.. Octa = 8 right? lol or 6?

I used this formula for my 65G planned purchase it's dimensions are:

48"L x 18"W x 17"H = 14688 / 231 = 63.5844155...

While it isn't exact, this could be a result of the Tank manufacturer where i'm getting mine and i'm looking at Acrylic.. might Make a difference. However, I did find no matter what dimensions you give it you get a x.5 so I assume to round to the nearest number Hope that helps

On a sidenote, reason i'm getting the 65G in the firstplace is I wanted to get Rainbow Bosemani's

 

[SnakeIce]

As long as my understanding that the tank is as follows: the sides to be 10" long and oposite sides to be 17.5" apart as you measure through the tank, the volume is as follows

Center portion 10x17.5x24=4200
each remaining side is a parallelogram with one 17.5 length and one 10 length. average those two

13.75 times (17.5-10)the width left from center portion above...

13.75x7.5x24=2475

2475+4200=6675

6675 cubic inches is your tank volume or 6675/231=28.8 gallons

I would still look at this tank as being only 17 inches so quite a small tank dispite the volume. Fish use horizontal space for territory and liveing space.

 

[Black_Moor]

:bowing: at your mathematic greatness I never was great with it

 

[Bosemani Fan]

Thanks snake, I was thinking around 30gal.

 

[patoloco]

If it looks like this, then we can apply the triangle area formula, multiply by 8 and them multiply again by the height.

Triangle area = (base*height) / 2 = (10 * 8.75) / 2 = 43.75 sqr inches
Multiply by 8 = 350 Sqr inches (tank footprint)

Now, we multiply by the height (24") = 8400 cubic inches.

Diveide by 231, an we get 36.4 gallons.

If I'm not wrong, this is the total volume.

 

[tlaug]

No matter the volume the tank can not hold the number of fish that a normal tank will hold do to its shape. This type tanks are best with small livebearers(mollies,guppies,etc.) Watch out for green water in this tanks and o2 levels.

 

[themadblimper]

Should be a 45 gallon.

 

[Pretender]

I don't understand the dimensions - is it not a true octagon? Does every pane not measure 10 inches in width? Or are the angles not the same at every vertex?

If it were a true octagon, and the panes are each 10 inches in width, it would be a little over 24 inches across the tank from flat to flat. (or 26 inches from vertex to vertex.)

Where does the 17 inch measurement come from?

 

[patoloco]

I was getting the same impression. There is no way a regular octagon can have the stated measures. I tried some advance computer modeling (a.k.a. drawing in the screen and measuring with a ruler ) for that tank and the numbers didn't fit at all.