It is much better for the ifsh if you add a pump or filter in your tank.
yes
the fuel pumps are in the tanks and there are two of them have fun
Yes, the bigger tank the better. They actually HATE goldfish bowls. (they're not nearly big enough). Goldfish usually need a 20 to 30 gallon tank
Pumps, buckets, tanks.
On the in-tank fuel pump, or pumps if you have two tanks.
Yes, when a submarine boat pumps water out of its flotation (not floatation) tanks, the submarine should rise.
yes
89 Fords have low pressure pumps in tank and high pressure pump on frame Fuel pumps for injected ford trucks are inside the tanks.
As goldfish are coldwater fish, oxygen is not the main problem in their tanks (unless they are overstocked). Most fish enjoy having plants in their tanks as a place to hide and to add interest. However, goldfish will often eat the plants. An air pump on its own will not do much except giving your fish a stream of bubbles to play in. However, for an extra $10 or so you can add a filter to the end of the airline. The bubbles will draw water through the filter. This will be far more beneficial to the goldfish than anything else. I strongly recommend putting bio balls or bio rings in the filter to remove the fish's waste more effectively. Goldfish are not suitable fish for very small or unfiltered bowls or tanks.
No, fish can't hear.
totally in tanks I've had a fish in a tank and in a bowl and the tank ones lived longer
Yes