My RIR chicks are 3 weeks old today and got to try out their new watering system (got the idea from BYC, of course). Two hours and they had the chicken nipples figured out!!! Has anybody had issues with mildew/slime in a system using the chicken nipples? If so, any suggestions on how to mitigate that issue? I'm still adding about 3 tablespoons of organic ACV to each gallon of water and not sure if that will make things better/worse.