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**To**:**<nfc at actwin_com>****Subject**:**Re: NFC: Re: Filterless Aquariums.****From**:**"James R. Madej" <gollum at abs_net>**- Date: Sun, 11 Feb 2001 22:01:34 -0500
- References: <Pine.LNX.4.21.0102111938000.350-100000 at fatiha_com> <3A874CD8.2BE695C at pi_dune.net>

I still believe to approximate the displacement of h2o from an aquarium; it would be the simplest way to weigh the materials and divide by 8.14 pounds the weight of one gallon of water ) and subtract from the total gallons of the tank. The formulas previously mentioned need far too much calculation. A simple but direct route is the method of choice, at least for me. Just be certain to use dry weight so not to calculate the saturation of the substrate. Lets check with the silent ones??? N E lurkers out there??? James ----- Original Message ----- From: "JLW" <JLW at pi_dune.net> To: <nfc at actwin_com> Sent: Sunday, February 11, 2001 9:39 PM Subject: Re: NFC: Re: Filterless Aquariums. > Sajjad, the correct number is 231. :) Inches/231 = Gallons. > > Second, gravel/sand does NOT displace the volume of it. There's space > between teh grains, which is filled with water. Figuring out the volume > isn't easy, and differs on the type -- bigger grains, less volume per > lb. An easy way to figure it out: Fill a five gallon bucket with the > desired media (smaller is okay, too) and fill it to the brim with > water. Pour the water carefully out into a container, and you'll get > the ammount of the volume that is NOT gravel. So, if you get one > gallon, five gallons of media actually is four gallons of media. > > Josh. > > Sajjad Lateef wrote: > > > > On Fri, 9 Feb 2001, Gary Rollwage wrote: > > > How much (on the average) does gravel, plants, etc etc. displace > > > the amount of water in a tank? > > > > Hi folks, > > Haven't read all NFC mail in a week, so, apologies if this has been > > answered already. > > > > I presume that plants would displace only a small amount of water. Even if > > you have a lot of plants, you aren't loosing too much of water volume. > > > > I also presume that stones, sand and gravel would displace the about same > > amount of water as their volume. Multiply the length and depth of the tank > > with the height of the gravel to get the volume displaced (in cubic inches > > of you are using inches as the measure). > > > > There should be a standard conversion from cubic inches to gallons which I > > don't know. Here is an approximate attempt: A cubic inch is equivalent to > > 16.4 cubic centimeters (cc) and there are 1000 cc in a liter. Assuming > > 3.75 liters per US Gallon, we have about 3750 cc to a US Gallon or about > > 229 cubic inches to a US Gallon. > > > > Assuming that you have 3" of substrate in a 55 Gallon (3x1 ft base), you > > would then have 3 x 36 x 12 or 1296 cubic inches or about 5.6 Gallons of > > substrate. Approximating further, each inch of substrate in a 55 Gallon > > tank would displace about 1.5 to 2 gallons of water. > > > > Again, these numbers are all approximations. If anyone has better numbers, > > please do correct me. > > > > btw, does anyone have Ray Wolff's phone number (Wisconsin Rapids, WI) ? > > > > Tony/Ray Suydam: I got a filter from Marineland in the mail for the AATP. > > > > Sajjad >

**Re: NFC: Re: Filterless Aquariums.***From*: Sajjad Lateef <sajjad at acm_org>**Re: NFC: Re: Filterless Aquariums.***From*: JLW <JLW at pi_dune.net>

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