Used carbon should not be used. You should buy activated carbon, it's already labled that way on the box.
Yes absolutely.
If you mean the smell, you can use carbon in your filter. You can get aquarium carbon from an online retailer such as www.bigalsonline.com
24 hours and do a water change
The main use of aquarium plants is to place them in a fish tank, this encourages fish to use them as spawning sites. Aquarium plants also help to keep the water at a good quality by binding waste.
You would use a aquarium chiller to cool the water in your aquarium for certain types of fish that need cooler water then room temperature. It helps to keep the water at a constant temperature.
yes, in small doses it can be used to prevent infection.
Aquarium salt is manufactured for different reasons than making your aquarium the perfect environment for salt water fishes. You may use it in an emergency, but long term is harmful to your fish. Marine salts contain the necessary salts and minerals that fish need are the best salt to use.
No. This will not activate for use outside North America.
Anything labeled safe for aquarium use. Beyond that, it depends on what type of fish you are keeping, and whether or not you have plants, for which type of aquarium substrate (gravel or other lining for the bottom) should be used.
basically you have to use an aquarium
A small pebble from inside the aquarium
Both carbon (or a carbon compound) and oxygen are used in the formation of carbon dioxide, which contains both elements.