very sick brown knife...please help!!!!

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ifitsmellslikefish

Feeder Fish
MFK Member
Feb 1, 2008
10
0
0
no.va
I have had a brown knife for 6 months now with no problems. a few days ago i did a water change 20% as i always do. Now however my knife is covered in a white film, which started out a few days ago as little white specks i thought where parasites. so i treated with ick meds. he is kinda floating, letting his back side sink then swimming again. all my other fish in the tank are fine. I am at a loss. please help, i really like this fish and dont want to loose him but i am at a lose as to what to do for him.
 
a little background.
29 bow front
marine land 70 filter
heat at 72-75
aqua safe plus conditioner
feed once a day
golden gourami
3 tiger barbs
i noticed this problem after a water change and added prime conditioner because i did a litmus test an noticed my nitrite & nitrate where very high.
when i first noticed the "parasites" i added coppersafe for ick velvet and other external parasites
 
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