How to care for Cockatoo cichlid/Apistogramma cacatuoides

Hi! I just bought a pair of Cockatoo cichlids online, and they should be arriving Wednesday of next week. I've read a little about the care of these guys, but still have a few questions. I may not be able to make a trip to the LFS this week, so I won't be able to pick up any cichlid pellets, so what else can I feed them in the mean time? What do you feed yours? Oh, and I can't afford to buy a new cave for my aquarium, and the current cave has already been claimed by another LARGE fish. So, any good ideas on how to create a natural looking cave, preferably not out of a flower pot unless you won't beable to see it in the end. Any advice helps!
Thanks,
Tirzah

Well, not to be rude, but actually quite a bit. I have a perfectly stabalized tank with decent fish, a freezer stocked full with carnivorous fish foods, and large plants throughout my tank with wide leaves for the fish. I'm more prepared than it may seem, I just wanted to know is anyone had some advice. Thank you for the cave idea!

Oh! That's a great idea! Thanks Brandon! Would you happen to know what kind of glue would be best? Liquid Nails, Glue Gun, or some other kind? Thanks for the tip though, it should work great!

From what I've read, it should be ok, but if anyone can confirm this, it would be great! The glue stiks I have are surebonder if it helps. Thanks for all the great advice!