They are as happy as can be. They come up and greet anybody who comes by the pond. They even like being pet. If you stick a finger in they rub all over it. I will look up the lava rock.saltwater60 said:You don’t really have 3 koi in a 100 gallon pond do you? They get 2-3 feet and will rapidly out grow that. I’d recommend goldfish. I have 4-5 koi in a 5500 gallon pond.
I don’t run a filter on my ponds I use a stream bed and lots of snails and love plants. My water is crystal clear and no algae.
You can make a filter out of a 5 gallon bucket with lava rock. Look on YouTube.