u/Old_Side_4959

I have a mini pond setup of a 3 feet tank keeping 5 ranchus (about 5 inches) and a Pothos plant that is planted on a hydroponics system (now fully covered behind the Pothos) that has grown to cover the entire wall. How many goldfishes do you think the tank is able to support with the Pothos helping to remove nitrates and unwanted stuff? FYI I have a stacked filtration system providing mechanical and biofiltration at the right side of the tank.