Kh 53.7
gh 179
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Kh 53.7
gh 179
Water looks fine to me so that eliminates problems there. It could be it has some parasite, add the salt as sayid suggests and monitor for a day or two. Sometimes fish can really damage themselves when they zing about, so make sure you look for damage too.
Thanks Steve, they all seem fine this morning, though they are still ducking for cover for some reason. I will watch and keep a close eye on that young one today and if it think it needs a salt dip i will do so tonight.