how to make a current?

plug it into the mains!

do you mean a flow in the tank?

if so, filters do it... do you have a filter?
 
of corse i have a filter but i want to make a strong current so my fish can swin in it but i have to put some sponge on my filter tube cause my fish keep getign stuck
 
Get a "power head" then, such as maxijet. The inlet just has a plastic guard over it to prevent fish being sucked in. They usually have suckers on the back to make positioning in the tank nice and easy.
 

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