Sorry to hear about Jessie 6. Hopefully Jessie 7 perks up soon. I am pretty new to Bettas, but I got a lot of good advice from the folks at PetSmart here in Calgary. I use Nutrafin Aqua Plus to treat the water (VERY hard water in Calgary) a little aquarium salt, and a Bacteria Supplement made by TopFin. I was told by everyone that the Bacteria Supplement is very good for fish. Anyone else care to comment on that?