I'm new here, so if I'm not following proper procedure in any way, please offer gentle guidance!
I have a 1,000 gallon pond with (about!) 15 to18 goldfish and 8 to 10 red nosed minnows. The pond is about 3 years old, has lots of vegetation and has an in-pond mechanical filter and an external bio filter that consists of two 1/2 wine barrels filled with lava rock. The pond seems very healthy. I originally stocked it with two 8" goldfish, a blond standard and a blond/orange comet, soon after adding a number of goldfish "feeders" of mixed colors and types (standard and comet). I later added the minnows and a couple shubunkin. The fish have bred the last two seasons and I now have quite a family. In the batch of feeders were three black coloration, standard goldfish. Their batch mates are now around 6 - 8" while they are only about 2 to 2 1/2". Fish born and raised in this pond are now larger than these three black colored fish.
Can anyone tell me why these particular fish are remaining small?