What is pumped into a fish tank that causes those bubbles to form Is it water or air?
Well, I can’t really say how your fish tank was set up. It may have had an airstone, where a pump outside the tank pumps air into the tank and it makes bubbles, or it could have a filter, which filters the water by pulling the water from the tank through the pump. Either type adds dissolved oxygen, and they both do it the same way. The bubbles from the air pump don’t actually add oxygen. The bubbles rise to the surface and pop too fast for that. More dissolved oxygen is absorbed at the water’s surface and all the filter and air pump do is force water to move to circulate it in the tank. If you have a good science teacher, they will know that’s what happens too (but it’s surprising how many don’t!). Here’s some websites you can use to support what I’ve said: http://thatfishblog.blogspot.com/2007/11… – see beginning with the 3rd paragraph h
