Dojo Loach in Trouble... can you help?

Hello -

One of two dojo loaches that I've had for nearly a year has become
sick. He lives in a 72 gallon tank with a school of black skirt
tetras, a school of Danios, some White Clouds and a largish
plecostomus (8").

This dojo is exhibiting the following symptoms:
- Lies on his side
- Does not eat
- Appears paralyzed from just behind his neck down to his rear fins
(not tail tail fin)
- Cannot move, except for "hopping"
- Tries to corner itself
- Has a white "rash" area on his side, near his rear fins
- Has a swollen body from just behind his neck down to the white rash
area
- Breathes shallowly and rapidly, occasionally slowing down his
breathing
- Eyes appear to be black-rimmed, and slightly downturned

I moved him to a 30 gal tank (filled with 10 gals water), and began
treatment with Maracyn-Two, thinking he may have Dropsy and/or Gill
Disease. Another thought was maybe the plecostumus rammed him and
injured him? I'd like to save this old chap, and am wondering if
anyone has any advice. If he's too far gone, how would you deal with
him?

Here is a picture of him: http://www.endofthestreet.com/helpdojo.php

Thanks in advance,

-Mike, Roseville, CA