Use a funnel and pour gravel into the jar

Add some plastic plants

Tie the fish of your choice with enough of the fishing line to hold the fish at a desirable level. (By using the 2 lb line, the line will almost completely disappear in the bowl)

Add one drop of blue food coloring in 2 cups of water, fill jar with the blued water

Place fish in bowl using the fishing line, screw on lid

Tie remaining fishing line to the top of jar, hiding under the lid, cut off extra line.