HELP: angel acting srange

Mar 10, 2005
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Columbus, OH
I have an angel that just started today swimming with his face pointing towards the top of the water and his stomach appears to be swollen. I have had him for a long time and never have had a problem. All other fish in the tank are acting normal including other angels. this occured after doing a water change today. I hope its okay
 
Could be a swim bladder infection, I once had an angel act in a similar way, only it would face the floor :(
 
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