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I'll leave it to others to comment regarding the health of the fish issues. In regard to the health of the pond, it sounds like you need a different filter or need to spend a lot more time on maintenance. Conventional advice is that your filter handle a minimum of half the pond volume every hour, 24/7. I prefer to turnover the pond volume in under an hour. It should never be a trickle. Sponges in a koi pond filter are tough work. I had such a filter nearly 30 years ago (not the brand you mention... I'm not familiar with your brand) and got rid of it after one season. It was simply too much work to keep it clean enough for the water to flow. I do not like the bubbles showing on the surface of the pond. Looks like a high level of dissolved organics, which indicates you may need to do more water changes.... or that the filtration is inadequate to cope despite water changes. In the long run, you need to address the filtration issues to maintain the fish for long lives. ....BTW, you have plenty of fish for the size of the pond. As they grow, you'll find that 3-4 koi and a couple of goldfish is the max even with lots of maintenance effort.
P.S. The lilac is grand. Can't grow those here.
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