I just returned from 10-day vacation. Surprisingly the algae issue mentioned in a previous thread now seems to have cleared...or ...water is as clear as I've ever seen it. But now all 8 koi/goldfish are acting sort of strange. They are all huddled near the bottom and not coming up to eat when I feed them like they normally do. They dart and dash around for a few seconds, then huddle together at the bottom again. Very strange. I don't know if they've always done this and I just wasn't able to see them or if something is wrong.
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