Go with the watering system and never look back. And don't think with two racks you will keep up with 30-40 snakes. I have 3 right now at 4.1 and I can't keep up with the snakes that eat rats. A lot are on rabbits which I am also breeding. And I highly suggest putting the rats in the garage, trust me lol.

Another word of advice, try out freedom breeders spring loaded sippers. Even if they leak it is so slow that you won't flood a tub unless you don't pay attention for weeks on end.

Here are my racks for an idea on the setup:

The two on the left are the new style with water.

Sent from my Samsung Galaxy Note 3