yep, I'de agree it's likely the barometric pressure. But also possibly internal parasites. check their poop, and be patient. prazi pro imo is a great product for internal parasites and I recently used it to treat my fire eels and oscar and had no issues with the medication. But I wouldn't treat unless your fairy positive that is the problem. the big tip for me was white poop, off feed, and stomachs still "full" after a few days of not eating. otherwise my fish also acted very normal behaviorly.
