Tangue Verde
You have done a lot, I can't believe you still have RSA. You have also spent alot of money which I don't have.
I tried the light change from 14 actinic/12 daylight to 10/8.
I also was told by Hector that the shrimp cubes I was feeding every other day along with flakes every other day was too much. Seems the cubes should have been cut in fourths.
I still only change 10% water from Southwest every 2 weeks. (not as diligent as your twice weekly.
Perhaps its the water from SW. Hector advised having it checked when you get it, he claims he does that and charges the same $1/gal. I will start getting mine from him next.
I have not added any chemicals, or for that matter spent any extra money.
Now, for the kicker.
I read about using erythromycin, an antibiotic, and had some unused penicilliin here so I tried it for 3 days. IT WORKED
Then I got the brillant idea to ask the real experts, after the fact, and what they say about the possibilty of killing off good bacteria as well as bad got me to worry.
I'm 2 days post penicillin: fish are still alive, and what few mushrooms I had are still ok. The RSA is 90% gone.
I'll keep you posted if anything changes or call me @ 696-0165.