Anonymous
/an/ why are my aquarium fish breathing air from the top of the tank? They don't seem to be very stressed out, and the filters water falling provides some aeration... any ideas?
>> Anonymous
Maybe it's not providing ENOUGH aeration, depending on the volume of the tank, surface area, and number of fish?
>> Anonymous
You should take a sample of your tank water in a clean container that you rinsed in tap water and then in fish tank water to a relatively large fish store and ask for a free test. When the water turns bad, it can be very hard to regain a healthy balance. Decomposing fish waste and food causes dangerous chemicals inside the tank. If the fish poop is not being broken down in the filter, this could be an example of too few good bacteria inside the tank. Also, get a good book on fish keeping. They are really cheap if you can find one used.