You can buy equipment that will clean the water and stabilize its temperature under Supplies. When you buy the equipment it will automatically be installed in all of your tanks.
Source: The instructions on the Baby Bratz Fish Tank Game.
There are many different aquarium animals that will clean algae off the walls of your aquarium. I will name a few: Cories, Plecostomus (AKA, Pleco) and more. There are some algae eaters that are not...
yes we can clean but make sure that fish does not get any serious problem its will make to dead to save her do not use net use poly thin cover to catch fish with water so that fish life will be saved
That depends on how dirty the tank is and what kind of 'dirt' is in the tank. It also depends on what species the fish are and how baby(tiny) they are. If the dirt is algae, then I'd simply scrape it...