It definitely appears to be HITH. All of the articles that I have read say that the cause is poor water quality, but I'm at a loss on that one. Due to the tank housing discus I have always done a 50% WC weekly using use RO/DI water and I clean any heavy muck out of the filters then as well. My water always tests at perfect with no ammonia or nitrite. All my fish seem quite happy and thrive. My tank is heavily planted with live plants and the only time that it has been "dirty" is when I changed the aquascape and stirred up some of the goodies from the substrate.
As has already been mentioned, some claim that food is the source. I only feed Tetra Bits/Flakes, OSI Shrimp pellets, and Hikari frozen blood worms and never live food. It would be a further relief if I was able to determine what source of the trouble is, but it seems like I might have to live with a mystery. I would however welcome any counsel on alternatives to my feeding regimen since that seems like the most likely source to me.
New Questions:
1) I looked up metronidazole, but was unable to clearly determine if it is safe for planted tanks. Can someone answer that one?
2) If it is safe for planted tanks should I just go ahead and move the ram back to the main tank for the treatment cycle?
Thanks again for all of your help! I can't tell you what a relief it has been to receive your valuable info especially after searching via google proved so inconclusive.