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Old 01-12-2013, 09:45 AM   #1
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Need some help determining size of tank

Okay so yesterday I went and picked up someone's old supposedly 35 gallon hexagonal saltwater tank. Well I bring it home, and man that thing is massive. How can it only be 35 gallons?? So I've been trying to find a calculator online to determine the gallons but I'm getting two different answers... and I'm thinking I could be measuring incorrectly. How exactly do you measure a hex tank? What is the length? They have six sides. Is it the size of one side x 6?

Aquarium Volume Calculator

that site there is telling me the tank is 54 gallons... with the height being 29, the number of sides being 6, and the width of each panel being 12 inches.

Hexagon Aquarium Calculation Tools

This site says it's only 47 gallons. That being the width of one side being 12 inches. What does the width of one side mean? I thought width was like dept... but maybe I'm confused?? How do I measure the width? Could I be doing it wrong?

Either way, it doesn't seem as if those dimensions are of any standard tank... which leads me to believe how I measured it was not correct. Any advice would be well appreciated.
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Old 01-12-2013, 10:09 AM   #2
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If the width of a side is 12" and the height is 29", the volume is roughly 46 gallons.

To calculate the volume, we need the length of 1 side (L) and the height of the tank (h).

First, we have to calculate the area of the base (A):

A = 1.5 * √3 * L≤

Volume of hexagonal prism (V):

V = A * h = 1.5 * √3 * L≤ * h

So,

V= 1.5 * √3 * 12≤ * 29 = 10849.57 cubic inches

10849.57 cubic inches = 46 US Gallons

46 US Gallons is not far from 35 Imperial Gallons so maybe that is where that number came from?
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Old 01-12-2013, 10:23 AM   #3
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Thank you! Yes, the length of one side is definitely 12 inches and the height is definitely 29 inches. Is there any reason why this tank is such a random size?
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Old 01-12-2013, 10:28 AM   #4
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Not sure. Tanks are usually standard sizes but There are a lot of odd tanks out there.
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Old 01-12-2013, 10:35 AM   #5
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Well the people I bought it from certainly didn't know what they were doing. They told me they haven't done any cleaning except scrub off algae in 5 years... and that "all you do is add salt"... Perhaps it was UK gallons. I know Pet supermarket sells tanks in UK gallons around here (I have no idea why) and they told me they got their stuff at local pet stores.
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Old 01-12-2013, 09:43 PM   #6
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Turns out I did measure wrong. The tank is actually 31 inches tall, which makes it 50 gallons. That makes more sense, but I still have no idea where the people got 35 from. How can you have a tank for five years and not know how big it actually is? lol
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Old 01-12-2013, 11:25 PM   #7
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Can anyone tell me what kind of bulb this is? I know it's a fluorescent tube but is it T4, T8... ? It is 17 inches long, if that helps.



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Also, what is this thing?

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Old 01-12-2013, 11:34 PM   #8
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Look like a standard t8 bulb and the Round thing is your starter for the light. You can find replacements at you hardware store if you need one.
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Old 01-12-2013, 11:37 PM   #9
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Thanks! Does the round thing ever need to be changed? The bulb is definitely due for a replacement. I don't know how it is still working, it says the year 2008 on it...
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Old 01-12-2013, 11:43 PM   #10
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I don't have a saltwater tank but from what I've read on here one t8 bulb is not that much light. Especially on a tank that tall.
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