I have had to leave one of my koi in my outside pond for the winter. First time doing this since I have always brought them inside to a pond in the basement. This year all the other fish got sick and I left the largest koi outside in the pond. Unfortunately all by herself.
It is 7 years old and a very large size koi. I live in Colorado. The weather has been moderate so far. I have a de-icer to keep the pond from freezing over. The waterfall and pump are still running. Not too much splash into the pond to cool it down.
1. Should I be doing partial water changes. I have replaced water 3 times due the water level decreasing because of ice dams from the waterfall.
2. What should I do in the spring when the water warms up. Any additives. There are leaves in the bottom of the pond and lots of algae.
3. Has anyone use Aqua MEDZYME in the spring?
4. How large of a water change do I do in the spring? Should I move the koi to a container while I do this?
5. What type of beneficial bacteria does everyone use. I'm not too sure mine is too effective anymore.