If a tank smells bad then you're doing something wrong! A healthy established tank never smells. It is probably heaped full of ammonia from fish waste and uneaten food, ammonia kills fish as well as really stinking!
If your tank smells rotten then it's your fault and you need to step up your routine tank maintenance.
A properly cycled tank that is not overstocked, and has the proper amount of filtration should smell like clean wet earth (dirt). If your tank has a fish odour, it's possible that either a fish has died that is rotting in the tank, or that you are not doing weekly water changes of at least 50% of the water.
Cuz u let it get dirty and GREEN NASTY <------- the green stuff is algea
what makes the fish tank smell is the bacteria and poo that they make.
Salt Water Fish
Assuming the dirty fish tank has had fish and water in it, without doing various specialised water tests it is impossible to tell what is in it.
It might be unsafe to drink because fish food, fish scales, fish waste, and many different kinds of bacteria are in fish tank water.
Live Aquaria provides you with supplies to preserve a fish tank with salt water fish. Fish tank provides lighting, fish food, and more to help you maintain your salt water fish tank.
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The white scale on the inside of the fish tank is from a buildup of minerals that were in the water.
Robert Frost
Scoop all your fishes to another tank or tub of water and clean the fish tank just as you would normally without the fish
the cause might be a sick fish, a dirty tank, or over feeding.
put the live fish in a bag filled with water and change the tank then put the fish back in.
you can fish the fish out of the tank with a net or a cup and keep them in a bowl with some water that came from the unclean tank, until the next tank is ready for their arrival. So when you have the next tank ready, you can just take the cup and dump them in with the water that you left it in when cleaning.
No; water in a fish tank is not a mechanical mixture. It is a homogeneous mixture. Mechanical mixtures are heterogeneous mixtures.