Hey all, i have 8 neons and 1 bristlenose in a 20L tank. they have all been fine as up until i did a 40% water change almost a week ago. i put in stresscoat when i did it. but now the neons seem to just sit on the bottom, they still are colourful and come up to eat but just dont swim around like they used to! i tested the water and pH is 6.8, zero ammonia and nitrites. i usually do a 50% water change and they have always been fine. the bristlenose seems as good as gold. its just the tetra im concerned about. i can see any obvious signs of disease, altho i have treated them recently for whitespot and this is why i did the waterchange. should i maybe dose them again?? i just dont know........