1 week old 10 gallon tank 2 plattys, Gaurami, 2 guppys, 1 red eye tetra, 2 spotted gobys I have been researching and studying as much as I can to have a successful tank and be a responsible owner. Still on the learning curve and frustrated with the recent events. Catfish were being lethargic, closed gills, amd occasionally running to the top of the water. Which were all signs of high ammonia that i missed due to being new. Unfortunately both of my cory catfish have died within the last 24 hours. I have been testing my tank 2 times a day with the 5 in 1 strips, I have a ammonia test attached to the tank and have been watching my water like a hawk. Currently here are my water conditions after a 50% water change: Water temp is 81, i normally keep the water at 78 it is a little high from the water change. Gh is 60-120 Kh is 80-120 Ph is 7.5 No2 is0.5 - 1.0 No3 is 0-20 To prevent more fish from dieing here are the chemicals i use in the pictures. I added all of these to the 50% water change. Any input would be greatly appreciated!