Yes.....yes, it 
is!  It's like getting a sip of water out of a fire hose!
...and it can be very difficult to separate the wheat from the drama chaff in order to proceed with logic and thus success.
That's too low, IMO, for 15 week old birds.
Go with something around 18-20%.
Tell us more about your coop and the water problems...
...pics would be of 
great help here.
Oh, and.....
Where in this world are you located?
Climate is almost always a factor.
Please add your general geographical location to your profile.
It's easy to do, then it's always there!
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