Assume a fish in fish tank is in stant still condition,when we move the tank whether the fish will hit the wal

Answers:
Sir Isaac Newton said, "An object in motion will tend to stay in motion unless acted on by an outside force."

When you move the tank, everything in it is then in motion. When you stop the motion, the water sloshes, the sand shifts, the decorations fall, right. If the fish is close to the wall, it hits the wall. If the fish is not close to the wall, the water stops the fish from hitting the wall by slowing his movement toward the wall (friction). Eventually everything stops moving, right.

That's why you don't hit the bottom of the pool when you dive in, the water provides friction to slow your forward motion. Don't dive in shallow water, there is not enough water to slow your motion before you hit bottom.

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No, the fish will react in time.

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No, it wouldn't hit the wall.

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definetely not..
i'm sure.
refer einsteins theory of relativity.

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yes

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gentle move tank, fish not hit wall.
prolonged acceleration, fish contact wall.