Ok so I finally got my new rack up and running and I'm looking for everyones advice on a couple things... Some background info...I'm using diamond soft bedding and Mazuri rodent feed... I have 2 female small rats(around 60g) in each tub... total of 3 tubs right now and I'm adding more rats every week. Now to the questions

1. The rack has a built in feeding trough... do I just fill this up completely with food or should I only put what theyll eat in like a day or two??

2. How the heck do the rats eat through the feeding trough? I feel like the food is too big and the holes in the top are too small for them to actually eat the food. Should I worry?

3. How often does everyone clean their rat cages/bins? Right now I'm doing a complete bedding change once a week... is this too soon? not soon enough?

Heres the rack I have... hopefully it'll help you help me.
http://www.arscaging.com/ars3021.html