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I just got a Columbian catfish shark yesterday probably about 6in so far I have a 30 gal tank that it was a bit with filter heater u know he or she hasn't ate since I got it and it just swims at the top like it's eating the air going crazy
 

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u got air in the tank don't know much but when my fish constantly at the top like that its because oxygen is low as i said don't know much just from my little experience so far
 
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