The general rule of thumb in aquarium keeping is to have no more that one inch of fish per gallon of water. Thus, if you had a twenty gallon tank (with no substrate or rocks to diminish the total water volume), you could have five 4-inch fish. This formula also assumes you will change 25% of the tank volume each week. See What is a water change? Why is it important? for more details. Realistically, however, you will need to consider the following factors when choosing what size tank to purchase:

Weight distributing is based on the amount of loaded tongue weight the trailer has. To purchase the correct size weight distributing hitch (WDH), you will need to first load the trailer as you would tow it down the road and then have the tongue weighed. You can weigh the trailer tongue by using a bathroom scale or taking it to your trailer dealer to have the tongue placed on a tongue scale.

While there is no such thing as "too much" power in a sound system, the system should be powerful enough to fill your room. To help you pick the right product, each HSU speaker and subwoofer has a "Loudness Level" index —a rule-of-thumb guide to point you towards the best system for your space.

Our measurements are given in stem thickness first followed by internal diameter/length eg.: 1.6 x 12mm. Our rings are always measured internally. Straight and curved barbells are always measured between the balls. On curved barbells (eg., belly bars) measure the shortest distance between the balls along the inside of the curve. Inches to millimeters conversion (you my need to round up or down to the nearest whole mm as necessary):

The smallest size we carry is 6 5/8. The largest size is 8. We will always carry core products in full size runs -- 6 5/8 through 8. Unfortunately, our vendors do not always make "Limited Edition" styles in full size runs, so they may be unavailable in smaller and/or larger sizes. We are always working with our vendors to expand size ranges offered.

Most of the product descriptions on our website provide you with all of the information you need to select the right display accessory to suit your needs. If you need more assistance, our customer service representatives are trained to provide you the assistance you need to select the item that will best display your collectible. You can call our customer service department toll free, or contact us at for more help.

This may vary depending on your daily routine. The more time your baby spends in the cage the more room she will need. Remember, most States will have the USDA or State regulatory Department that may determine minimum cage size. Please check for permit requirements and all other paperwork needed, because this will vary form State to State. We recommend a small cage while you are weaning your baby.

Your air conditioner furnace filters size is measured by the width x length x thickness in inches. For example, a pleated air filter that is 20x25x1 means 20 inches wide by 25 inches long by 1 inch thick. Most residential air conditioner furnace filters are 1” thick. The actual measurements of each air conditioner furnace filters are usually about half an inch less than the listed size.

This depends entirely on what you'll be doing with the scooter. If you plan to do much highway driving, it will be highly desirable to buy the largest engine you can find -- at least 200cc. Around town, the engine may be smaller for most needs. Stock 50cc models really are only best if you will have minimal interaction with automobiles, as they typically have difficulty maintaining speeds much above 35mph, unless they have been modified to go faster.

SPECjAppServer2004 should not be used to size a J2EE 1.3 application server configuration, because it is based on a specific workload. There are numerous assumptions made about the workload, which might or might not apply to other user applications. SPECjAppServer2004 is a tool that provides a level playing field for comparing J2EE 1.3-compatible application server products.

You might, but fertility treatment is very individual. There is a study on clomiphene citrate that indicates that higher doses are needed for women with a larger body mass index, and a similar finding for gonadatropins.

To determine the correct size heater for your heating needs, you will need to use the following equation: In order to obtain satisfactory performance from your portable propane heater, you must use a tank of sufficient size to assure vaporization of the propane it contains at the temperature at which the tank is stored and used.

It is important that new or replacement equipment is not sized by "Rule of Thumb" or by duplicating the existing equipment capacity. The only accurate way to determine the correct capacity of heating and air conditioning equipment for your home is to have a load calculation performed on your home. There is a specific method to do this calculation. This will give the heat gain and heat loss design data for your home.

To insure proper fitment on EVS knee braces, circumference measurements should be taken directly against the skin with your leg straight. Use a soft tape measure if at all possible. If you do not have access to a soft tape measure, use a piece of string, rope or yarn and then measure that with a regular ruler or tape measure. See Measuring chart for detailed sizing & directions.

The EZcubes come in five sizes created for a range of uses, 12", 20", 30", 40" and 55". Our recommendations for the size you need for your job at hand is to always be sure there is empty space surrounding your product once placed inside the EZcube. If your item is too tight a fit then it will be difficult to crop the light tent out of your final image.

The main purpose of your power supply is to run your trains. To run your train your power supply must supply energy for your locomotive, smoke unit, sound system , and any lighted cars. You may also need power for accessories like switches, street lights, building and house lighting or any other accessories. Your TOTAL POWER REQUIREMENTS depends upon the number of locomotives or motors, and ALL OTHER items that require electricity. The length of the track is not a factor.