The chickpeas come from the can (Goya or any other). I open a can, rinse the chickpeas very well (get rid of the gooey stuff), and keep them frozen in a ziplock bag. To feed, I take a few (it works out to about 10 chickpeas or so for 2 tanks), let them thaw and get to room temperature, remove the skins (probably not necessary) and break them at the water surface between my fingers, They go crazy for these, and all minuscule pieces remaining after a couple of minutes of frenzy are eagerly sought after from the sand and gravel. Probably breaking the peas is not necessary (the dollars will of course take the whole chickpea and munch on it), but I do it because I like to see them come get it from my hand, and because it seems that this way all 8 dollars get a fair share.
I have also given green peas, red beans, and guandules, left over from my family's food. Rinse well, remove skins, break between fingers at water surface and see them eat.
The sunflower seeds are plain, roasted, unsalted. I take a pinch-full and break them with my fingers to both remove the thin skins, and to crush them so they are in smaller pieces. They love this! I tried peanuts and they eat them but no as eagerly.
Out of all the foods, the chickpeas and sunflower seeds are certainly among their favorites. But they do eat just about anything I throw in.
I try to give them both plant and animal-based foods, as I know they are not true vegetarians (in nature, they certainly include much insect/worm/etc, along with grazing on plant-like growth (algae/plant).
If you try either of these foods, let us know how it works for you. Cheers!