Corydora behaving strangely (kinda floating)

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Fishiesconfuseme

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May 2, 2020
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Location
Buckingham, England
Tank size: 120l
pH: 8.2
ammonia:0
nitrite:0
nitrate: 10
water hardness tds: 240
tank temp: 24.3 degrees Celsius

Fish Symptoms: Peppered Corydora is lethargic, keeps floating at the surface (correct way round) but not swimming, sits on the floor surface but slightly floating, sometimes swims around like normal

Volume and Frequency of water changes: 20% weekly or 30% fortnightly

Chemical Additives or Media in your tank: piece of driftwood

Tank inhabitants: 2 pearl gourami, 3 pearl danio, 3 Glowlight Tetra, 3 neon tetra, 4 black neon tetra, 2 peppered Corydoras and 2 nerite snails

Recent additions to your tank (living or decoration): 2 amazon swords but salt dipped before added

Exposure to chemicals: none
 
Could you post a picture and short video of the fish in question?
 

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