I originally had 2 dwarf gouramis in my 29 gallon and if you have seen my first post I took one back because they were fighting. Long story short I got neon tetras to replace one, the other gouramI killed 2 of them, so I took the other gouramI back for 3 guppies. One of the guppies started laying on the ground and eventually started swimming upside down into the substrate till it died. Also one of my neon tetras randomly died. All the other fish are thriving. I have been dosing a double dose of prime to detoxify the ammonia and nitrite every 24 hours and doing water changes every 2-3 days. My current stock is 3 neon tetras and 1 male guppy and 1 female guppy. One reason the guppy and neon tetra may have died was because I did a 30% water change and poured the chlorinated water in then put in the prime. Any help would be greatly appreciated. I'm debating whether to take the fish back and finish with a fishless cycle or finish out the fish in cycle. I'm a week and a half into the cycle and nitrate and nitrite have both appeared so both forms of bacteria have formed.