Yes - the fish you have now and the fish you plan to get should be fine with some ghost shrimp. 96 litres is about 25 gallons. Most people don't count shrimp in bioload calculations but if you have more than say 2-3 you should take them into acount. I usualy say 1 gallon for every couple of shrimp or so as they help clean up the tank and are very low waste producers. Besides this, there isn't actualy a limmit to how many you could keep as they are non-aggressive and don't take up much physical space. I'd get about 5-7 myself so that you can spot at least one easily at any given time - adds interest.