I have 6 guppy fry in a breeder net. They were born sometime yesterday and I've been giving them first bites fry food. I haven't seen them eat it, and theres always food still on the surface when I go back to check. I'm just worried about them. Is it normal to not see them eat? Would they have even survived this long if they haven't been eating? Params are 0 ammonia 0 nitrites and 5 nitrates, so it's not the water quality.