some how I feel like it's better to have than nI've found keeping them too warm will do it and so will dirty water. I change my chicks water several times a day. A combination of the heat and food, wood shavings and poop in the water it makes for a nasty concoction.
Last time I took a bird to the vet I brought everything I have in my collection of meds and VetRX is also included. My vet said that is good for nothing and I may as well throw it away. Just thought I would add that little info. I've read where others have posted that it is great to have.