Today i woke up and found 2 dead neon tetras and another dead lemon tetra.   the neon tetra last night was swimming really eratically.  The lemon tetra was kinda struggling to stay right side up.  I just bought theses fish yesterday.  Do they have any kinda disease that i should be treating the rest of my tank for so they dont die or will i be fine?
				
			
	            
