yeah, you should run it 24/7...also, 125 would be plenty for as many as 12 3 gal buckets....anything over that get a 250gph...they are cheap...like 29.99 or less at petsmart or petsmart.com ...plus you can get 0-10gph drippers (from Lowes/HomeDepot) and set it how you like....
-sD