Did you use any LR or LS to start this tank? If u still have ammonia and nitrite, you have to let the tank finish cycling. Stop changing water and let your bacteria levels, both nitrosomonas and nitrobacter get established. These are the bacteria responsible for converting ammonia into nitrite and ultimately less harmful nitrate. You really don't want to add livestock till your ammonia and nitrite are zero. Ideally with your nitrate less than 20ppm. Otherwise you're just going to be frustrated and killing animals needlessly. Also you don't need to keep adding prime and stability daily. The two products remove ammonia, nitrites and nitrates in different ways. Seachem Prime actually does not remove any of the three nitrogen compounds at all. Seachem Stability offers a more direct approach. The product contains bacteria that will activated when added to your aquarium.