40 gallon breeder tank question - The Planted Tank Forum
LinkBack Thread Tools Display Modes
post #1 of 4 (permalink) Old 07-30-2014, 02:33 PM Thread Starter
Planted Tank Guru
Blackheart's Avatar
PTrader: (2/100%)
Join Date: Jul 2011
Location: Sterling Heights, Michigan
Posts: 3,147
40 gallon breeder tank question

So is it true that a 40 gallon breeder glass aquarium actually holds more than 40 gallons? I've heard it actually holds like 47 gallons.
Blackheart is offline  
Sponsored Links
post #2 of 4 (permalink) Old 07-30-2014, 03:11 PM
Wannabe Guru
BBradbury's Avatar
PTrader: (0/0%)
Join Date: Nov 2010
Location: Greeley, CO
Posts: 1,945
40 G Breeder Tanks

Hello Black...

The typical 40 G Breeder tank dimensions are: roughly 36 X 18 X 17 and hold 40 gallons of water.


"Fear not my child, just change the tank water."
BBradbury is offline  
post #3 of 4 (permalink) Old 07-30-2014, 05:58 PM
Wannabe Guru
PTrader: (2/100%)
Join Date: Jun 2005
Location: Medina, Ohio
Posts: 1,571
The gallon designation on aquariums is just an industry standard and they generally hold at least the gallon size listed.

The outside dimensions of a 40B are a nominal 36" x 18" x 17", depending on manufacturer, and when you do the math, it equals a bit over 47.5 gallons.

For a true measurement of gallons, take the inside dimensions of the tank (or subtract the glass thickness of the panes), multiply them together and divide by 231, this will give you the actual gallons.

I have 40B's that are a nominal size of 36" x 18" x 15" and it equates to 42 gallons.

Eheim Pimpette #270
Eheim Pro II 2028; Classics Series -2215, 2217, 2260, 2262; Pro 2229 Wet/Dry
deeda is offline  
post #4 of 4 (permalink) Old 07-31-2014, 01:14 AM
Planted Tank Guru
lochaber's Avatar
PTrader: (1/100%)
Join Date: Jan 2012
Location: Oakland, CA
Posts: 2,317
I've got one of the Aqueon 40 Breeders, and I can't remember what the specifics where, but I measured the inside dimensions, and I think I came out closer to 45g then 40.

If I remember, I'll try to remeasure the inside and run the calculations again.
lochaber is offline  


Quick Reply

Register Now

In order to be able to post messages on the The Planted Tank Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:


Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

For the best viewing experience please update your browser to Google Chrome