I used
chlorine solution (used standard unscented Ajax or Clorox diluted in tap water 1:20). Dumped away plants, substrate, even the small sponge filter and two ramshorn snails that somehow found their way -I suspects the plants (but saved the suction cups for later). Scrubbed the whole thing with scrubbing thread that I purchase by weight, rinsed a second time using the chlorinated solution and then used tap water.
I mixed water accordingly (3:1 R/O processed drinking water and treated with Seachem's Prime tap water). Placed an Indian Almond Tree Leaf. Brought in a well seeded small
HOB filter without cleaning it much (I keep extra filtration running in most tanks).
I contaminated the temporarily tank -a five gal I just cleaned yesterday which was fully cycled. I am killing the cycle of that tank and re-cycling fishless. I won't risk other fish since I placed the sick fish, which has open bloody sores in there.
I didn't
acclimate the fish when I placed him in the temporary tank since those two tanks (actually all my Betta tanks) have practically the same water parameters, except for temperature (I don't use heaters, I live almost at sea level in the Caribbean).
Pepe
Santo Domingo