Here you go Filip. The first pic is the syringe with the airline attached. The container on the left is clean water. The container on the right has submerged FDBW bits in warm water. I stirred the bits so they are in the center of the container. Makes them easier to suck into the syringe.
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Now I suck up the bits and allow the bits to settle. Note the difference in water clarity between the two containers.
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After the bits have settled I then push out the extra water from the syringe leaving the bits in the syringe and suck up some of the clean water from the water only container. I think this helps to keep the tank water cleaner especially in such a small tank.
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Here's a vid with the bits added to the tank. I tried to do it one handed but scared the fry. Note the little guys in the back darting about. Hope that is not a developing issue.