Yesterday i spent the whole day noticing my fish not eating and looking stressed so I went to the forums and after a long night of research and help from many people, They told me that my 20 gallon fish tank was not cycled completely yet after almost 5 weeks and it was slightly overstocked so the bacteria wasn't keeping up with the ammonia levels being produced. Some people recommended Tetra SafeStart so i decided to go first thing in the morning and get some.
When i woke up i noticed 2 cory cats and 1 glofish tetra died overnight.
(these are the first to die since starting) So i removed them and went to the store and got the safe start. I did a 50% water change and added the Safestart. It's been three hours now and my fish still look stressed and now my ammonia is even higher now (4.0). I have been told that the safestart would throw off my tests but I'm worried that that ammonia level is still too high. What should i do? My fish still have not eaten since yesterday and still look stressed at the top of the tank. I have the lights off and air pump going. Tank Details below if it helps.
Tank Size - 20 gallon hexagon
Fish in tank - now have 7 glofish tetras and 3 albino cory cats after the three died
Temp - 78 degress
NITRITE- 0 ppm
NITRATE- 20-40 ppm