*goldfish*have Neon Tetras But They Seem To Be Dropping Off One By One. The Victim Will Start Swimming Around Top Of Tank And Colour Will Fade, Then A Couple Of Days Later It's Dead. I Started With Ten Tetras And Am Now Down To Eight, I Can't Notice Any Sign Of Disease Or Bullying, And The Other Fish Are Fine. ( I Also Have 2 Sharks And 2 Gouramis ). Water Is Testing Fine As Well?? 
