I would use Hikari frozen food. Get Mysis shrimp, and Spirulina Brine. Fish will take those usually. If they don't have Hikari, that's okay, the type of foods you should get are still Mysis and Spirulina Brine. If they don't have Spirulina brine, see about baby brine.
Stay away from frozen mixes at first. So some foods will say it contains bass, squid, mussels, abalone, clam, etc etc etc. Stick to simple mysis and brine for now, it's easier and fish respond well to them.
I would take one cube of each, put them in a small glass container, and put it in the fridge to let it thaw slowly (Or if you want to offer them food quickly, you can mix it up with a few table spoons of tank water) and feed them some of the mix -- I use a 2ml pipette for food. use whatever you want to feed with, but only feed a bit at a time, especially at first.
Whats gonna happen is the food is gonna smell great, and they're gonna poke their heads out, see you, and then probably go back to hiding. So feed, and then stand far away from the tank to let them feel secure. If they come out, and eat everything up, come back and feed them a little more. When fish are eating for the first time, I don't worry about overfeeding them. Some of these fish have come halfway around the world and not eaten for 2+ weeks. They are hungry, but they're also scared. A fish can hide and starve to death.
When you have new fish, you must remember at all times -- "Calories into fish", getting calories into them is all that matters.
Keep the frozen food in a plastic bag in the freezer so it doesn't spoil. And the food you have in the bowl should probably last you 2-4 days. two cubes would last me about two days the way I feed -- Leave that glassware in the fridge, do not refreeze foods.
they just look cool
