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Technology1 min ago
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For more on marking an answer as the "Best Answer", please visit our FAQ.You don't need a fish tank to test this. Get a small licquer glass and fill it to the top, make sure you get as much in as you can use another small glass to make sure it is at the top. Now how many 5p pieces can you drop in before any water comes out? Try it you'll be suprised. You see the water bulges but hangs together creating quite a bulge before it overflows.
The fish tank is the same thing, it would eventually overflow but you'd need a suprising amount of fish, or one big one!