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A fish tank would be considered an ecosyestem because there is a living thing in it. (the fish)
Aquarium holds living water animals or plants.
There is no reason for gasoline to explode in a tank. There is no heat or spark source in there. But the basic answer might be that there is little to no air (specifically oxygen) in the tank.
The bacteria living in and on live rock and sand.
No. Goldfish cannot live in a five gallon tank at all, they are very messy and potentially large fish that require an absolute minimum of 20 gallons. For a 5 gallon coldwater tank, paradise fish or white cloud mountain minnows would be attractive choices. For a tropical tank there are a lot of small species suitable for a nano tank, and you could consider the ever-popular betta, or some tetras or dwarf rainbowfish.
fish ,crabs,plant,snail and shrimps
If there are fish in the tank, the fish are pieces of life science. Why? Because life science is the study of living organisms and how they interact.
Algae
Fish tank.
Organisms live within an ecosystem, ie. Fish in a fish tank Birds in a hedgerow
you can put a betta in a 5 gallon tank
No, gravel covering the ground of the tank or bowl will do fine. If you can fit them, they might also like an aquarium plant (living or plastic).
Normally fish tanks need to be looked after because they contain living organisms such as FISH, plants, or invertebrates. Without proper care, fish and anything else that is alive will die.
You would need at least a 150 gallon tank
In there is a type of extremophile living in the gas tank of the jet aircraft, my first thought would be to add an alcohol based fuel additive which may potentially kill off that particular microorganism. Modifying the pH within the fuel tank might also curb the microbe growth (but might also further degrade the fuel tank).
Yes, ammonia can not only affect the growth of fish, but if the ammonia level in a tank is too high, it will kill them.
Can you have three pictus catfish in a five gallon fish tank