I never add straight to the pond once fish are in, I put water in a bucket, add dechlor, let sit for a minute and let an aquarium vacuum slowly add it to the water, time consuming but hey.
if I read correct;y the pond is only half filled.
The pond is in the early stage of cycling (one week).When ever I have a situation where my fish are acting "off" first thing I do is a water change.
Nine times out of ten when fish become ill or start dying it is due to water quality.
Considering you have nitrite showing up and fish acting off/ill I would do a water change.
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