I'm new to Koi and ponds in general and made a very rookie mistake.
I've had my koi for about two weeks now. When I went about buying my equipment I was lead to believe I was buying a filter/pump combo. After about a week the water was incredibly murky, and though my own research I discovered I was lead astray, or there was a miscommunication. I went out and bought a filter and got it set up right away. It's about 3 days later and the water is back to being crystal clear. There is still some debris, but it's clear enough that I can see fish poops on the bottom of the pond. One of my fish is gone. No traces of it. So I'm fairly sure a giant blue heron that I saw a few days ago must have gotten to it. Anyway, the rest of the fish are pretty much dormant in a group every time I go out there. It's not always in the same spot, but I haven't noticed them touch any of there food in a few days and I haven't seen them swimming unless provoked to do so, so I'm starting to get worried. I did add water and treat it, but that was about a week ago now. Any clue whats going on? What I can do? I'm really hoping my mistake didn't kill my fish.
Thanks in advanced for any help.