Greetings all, as some of you know I can be a bit of a koi hypochondriac. Not sure if this is anything to worry about but I am leaving town for 3-4 days so I won't be around to manage things.
4000 gallons, kh at about 120. Zero on ammonia, nitrite, nitrate. Lots of air. Water temp at 78.8. RDF to shower and also submerged media.

I did a FMG and praziquantel treatment recently. And then one week later did a second praziquantel treatment. I had had a little flashing and wanted to make sure everyone was clean. First such treatment in a year.

A week has since passed. Appetite was suppressed during treatment but otherwise everyone has seemed fine. Now the last two days my fish are starting to want to hand very tight in one corner of the pond. Very near the surface and huddled up sometimes putting noses up as high into the corner as they can. They are active but stay right in that spot. No fins clamped. No flashing. No isolating. Skin looks great.

Any thoughts?
I will be gone for a few hours and check back in before I leave town.
Thanks.
Ben