At first I prepare my jug with water: I always take the water out of a running tank, and put it on the floor - to get it cooler. I don't use very cold water - at my place temperatures around 20° C are working very good. I add always about one gramm of sea-salt per litre water, so the artemia nauplias will survive much longer in this water. I never monitored any bad influence to the fry by using sea-salt.
Then I put the TA into a box - I put about half a pill of oxygen-tabs on the substrate - I make crumbs of this pill by using a scissors.
One important thing I had to learn during my killi-years: I never use a fresh box - my hatching box is filled with water, some leaves and sometimes a small plant and a few snails all over the year. Before hatching I put all the old water and all the snails out.
750 ml of water is just the rigth amount for my box - so the level will be at about 2,5-3 cm. Now I add one or two snails - and a little BBS (baby-brine-shrimp) - so the fish have something to eat from the very beginning.
I put the box always on a warm place - 24-26°C are a good idea, the raising temperature in the box and the falling oxygen-level in the water will help to hatch the fry - the oxygen-level is quite high, so one don't have to fear to get too much belly-sliders out.
I did not develope this method at my place - many thanks go out to quite a few Killi-Maniacs, who helped me to solve problems in hatching.
