Feeding Adult Fish

[wolvie89]

I'm a total noob so please excuse me if this is an extremely stupid question. When i feed my fish flakes, the fish are too scared so they just sit at the bottom. I let them be and when i come back I'm really not sure if they have eaten because theres some thats sunk to the bottom. Should i leave it there and let them eat in their own time or is that the equivalent of asking us humans to eat rotten, soggy sanwiches lol... I really dont know what to do with these two. I dont care that they're hiding..i just wanna make sure that they are eating!!