Aquarium cleaning is a monthly task that must be done weather or not you want to do it. If you do it right the process can be very easy or difficult. The size of your tank can depend on how long it takes to clean. If you have a very big tank, and the tank is established then you may not want to vacuum out all of the debris it is good for the fishes growth and development. If you have a smaller tank the tank will take longer to be established and you may want to vacuum out all the debris.
When cleaning a tank, changing the filters is the first step. If you have a bio filter, or power filter changing the filters is a breeze. Just change the cartridge and place a new one in the filter. A under gravel filter is another story. You must remove all the plants, decor and accessories. Then you must pull it out from under the gravel to clean. These filters work very well in keeping debris lower levels, but are a hassle to clean the tank.
If you have an underground filter do not replace it back in the tank yet. If you have an established tank then leave the plants and decor, even if they have algae on them. If you do not have an established tank or smaller tank, (ten gallon or smaller) then wash off all the plants and decor. If you have real plants do not wash them. Washing live plants can damage or kill them; the best choice is to leave them in the tank. If the plants have algae on them, buy a Plecostomus or algae eating fish, they will take care of the plants.
After the accessories, decor and plants have been washed do not place them back in the tank yet. The next step is to siphon the tank. Siphon no more than one third of the water out of the tank. If there is still debris at the bottom of the tank fill it with water and re siphon until all debris is gone. If you have an established tank then only siphon out some of the debris and leave a little in the gravel.
When replacing the water only use soft water so the fish do not die of shock. Soft water is water without minerals. Tap water or filtered water is considered soft water. After the water has been replaced remember to not fill the tank too high because, the plants, decor and filters have to still be added.
Replace the under gravel filter if you have one. Also consider in investing a power filter, this will make your life a lot easier. Then replace the plants and decor. You're all done, and now your tank is clean. Remember that cleaning a tank can be traumatizing for the fish, so they might be timid for a while after the clean.
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Roshan Goodman gives cool info on aquarium tips and advice on how to clean an aquarium .