The gravel I have is fine RED gravel so no I won't be returning them. As reccomended by others I have tested it for sharpness because Kyon likes to sleep at the bottom of the tank and this stuff is smooth. (It actually says on the bag suitable for bottom dwellers and I double checked this with a friend I have who breeds pygmys who uses something similar for her tanks) I will be changing to sand in the near future anyway as I prefer the natural look of sand.
Last night I dropped a pellet each in for them, they didn't find them straight away but they are gone this morning, I hear they are night feeders. Kyon had a go at one but they are to big for him so I don't think he's ate them. I give weekly treats of frozen bloodworm or daphnia anyway.