My pond is identical to yours, mine has a uvc filter, and many plants, and I have many more fish without any problem. With good values of no2 and no3. You can see the photos here
www.gardenpondforum.com
Rookie
Congratulations on the forum. The first thing to apologize for my bad English. I am from Spain and I have come here because there is a lot of good information. Now I have a 270 gallon pond, two pumps, one solar and one electric, and a pressure filter. I control the electric pump via Wi-Fi...