So with this fin rot situation, I decided I just plain don't like everyone being in divided tanks anymore...stuff spreads to easily from one to another that way!! So I went out and got all the males their own 2 gallon containers. After washing them out really good, I filled them with clean, medicated water, and now they are all in their new homes...I also drilled holes in the lids for feeding and air..I wanted the lids on them so Samson can't reach into the tanks or drop anything else into them! He likes to take stuff like his toys up onto the shelf and drop them into the tanks!!!