I have always had a small freshwater tank 3 - 5 gallons with no more than 3 small fish. I just switched to a 29 gallon new tank and thought I could set it up and put fish in it along with my one remaining unhealthy fish. I thought it would be a new happy place for my old fish. I added 5 fish and a frog after a week and now everything has died ��. Should I start over? It’s been 3 weeks now (the frog must have died a few days ago . He hides a lot so I thought I just didn’t see him.