adding kalk?

The simple answer is yes you can. The best way would be to drip it. In fact for the 20 L nano that would be perfect. Read up on driping Kalk. Just get a container and hoop up drip line and let gravity do the rest. You can DIY or you can buy containers with drip lines. Kent makes one. You can also make the Kalk and use a dosing pump but the drip is easier and cheaper.
 
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