When I first paid attention to our pond that came with our house.... i noticed 3 orange fish... Back then I had no clue what they were and didnt care. I neglected the pond for 2 months. Then one day i come and note the water level was very low and the pump is struggling... so i added water. I noted the 3 goldfish still survived... They were 3 common goldfish. Fast forward a year later.... I added more fish and didn't want the three common orange..... they just took space. I felt guilty about relocating them or even euthanizing them... technically they lived in this home longer than I have and they even survived where other new fish did not....
So I made the pond deeper and kept them