Paco swims head down

Feb 10, 2009
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#1
I have two paco's that have been in trouble for three months. They struggle to swim upright, it's mostly on their side and now the one is fighting for his life head down.

I have done 50% water changes, bi-weekly and it doesn't seem to do much good for them but the others pop out of it.
Any thoughts? The fish store says its water quality but that doesn't help the paco's only the tetra.

jandava