Aquarium air pumps are almost exclusively sold at pet stores. Just about any local pet store should carry some models, and the larger chain stores like Pet Co and Pet Smart will definitely have a wide selection. Pet Co and Pet Smart also feature online stores to order from.
They do
yes
An electric air pump oxygenates the water in an aquarium, this allows the fish in the fish tank to breath. if there was no air pump the water would lose its oxygen and the fish would drown.
A large air pump with multiple outlets, OR a large airpump with a manifold to split the air into separate lines. check out www.bigalsonline.com they have a wide variety of air pumps available online a good prices
You should place it above the height of the waterline outside of the tank (unless you have a submersible)
An air pump check valve comes in a variety of sizes. This type of valve can be purchased for about 12 dollars to about 40 dollars depending on the size required.
Probably with an aquarium pump.
The main usefull purpose of an "Air Pump" is to drive/operate a filter and cycled filters are an absolute neccessity for all fish in any aquaria. Air bubbles do very little to improve things in an aquarium so if you have a power filter the air pump would be superfluous.
It is not possible for the fish on "My Sim Aquarium" to have eggs. All fish must be purchased from the pet store.
No, a filter in an aquarium does not provide oxygen. It helps to clean the water by removing waste and debris, but oxygen is typically added to the water through an air pump or other means to ensure the fish have enough oxygen to breathe.
Gravel for an aquarium can be purchased online at sites such as Amazon, Pet Solutions, Petco, Pet Smart, and eBay. Additionally, gravel may be purchased in stores such as Petco and Pet Smart.
Aquarium canister filters are available at any online website dedicated to aquarium supplies. Pets at home is a popular brand for this and also has an online store.