I have decided to introduce a betta fish into the ecosystem. It's a half moon betta fish. To introduce it to the ecosystem I first checked the water quality. Again the pH was too low at 6.0pH. I added pH up and did a 20% water change. I again checked the water quality and the pH was around 7.0pH. I placed the bag with the fish into the water and allowed the water temperatures to acclimate. I then introduced some of the tank water into the water with the fish. After 20 minutes I fully submerged the fish into the tank. My next step will be feeding the fish and checking the water quality every two or three days.