um... stop. turn around, do not go and catch fish. do not pass go, do not collect 200 dollars.
i think you really need to get your system up and running before you run out and pull fish out of the water.
have you cycled your tank yet?
do you have lights? food? filter / skimmer? SALT?
how are you planning on catching fish for your tank? 8O
also, what kind of fish do you expect to catch at the beach? 8O
i seriously think you need to step back and assess the situation a little better. i have been "planning" and buying and building things for my tank for several months now. patience is a virtue in this hobby. why are you in such a rush to get a fish?