Bringing in new dwarf frogs can be risky due to the Chytrid fungus (symptoms will only show up 2-3 months after coming into contact. This is the only reason I have not bought any more african dwarf frogs to add to my established tank. In the next couple of weeks/months keep an eye out for some of the symptoms so you can treat it if necessary (very difficult to treat). Heres a very informative site regarding Chytrid Read this first! - a dwarf African frog site

I alternate between frozen (thawed) blood worms and brine shrimp via a turkey baster dangling it in front of their face. It is very difficult to master this, so it may not be the best method for your pet-sitters. Setting up a small plate and putting food there every time will make daily feeding a lot less frustrating. You can feed sinking tadpole/frog pellets to your ADF's. The difficult thing with these is getting the frogs to eat them, some frogs will eat these pellets and some won't.

As for your water, testing for ammonia/nitrite makes it easier and will help alleviate the worrying of water quality. Dwarf frogs are very sensitive to poor water conditions during the cycling process. I've never had a dwarf frog in an un-cycled tank but I'd say do partial water changes, 30-50% every 1-2 days for the next couple of weeks until ammonia and nitrite read 0 and nitrates are present.