Ok, thats what I've been doing.

they'll come around, give them time.  Also if I were you, I'd get some Hikari carnivore sinking pellets and some floating carni-sticks.  They are a great pellet and fish seem to take to them far quicker. Just in my experience that is.

sometimes a floating shrimp or krill will get them used to the idea that its you that throws stuff in the tank... then they will start striking anything you throw in... then you can switch to a pellet.

I just cleaned the tank and theres some weird white floaty stuff that I got a lot of out but it seems like theres the same amount

I made sure that the mussel wasn't endangered before I decided to keep it, although I assumed it wasn't because they are absolutely everywhere. So far it seems to do ok, still alive at least haha

be careful, they bury themselves die and pollute your aquarium in a hurry.

Ive been checking every day just to make sure because I did hear if they die they make it nasty quickly.

UPDATE: My fish have finally started taking fish food. After around seven days of nothing to eat they decided (with the guidance of the sunfish) it was time to eat. My sunfish was attacking anything that dropped in. I also added 5 tiny feeder fish (that came from a amazing looking aquarium funny enough) and they were eaten immediately. Thank you everyone for helping me get started! Cant wait till I can try to do another tank! (probably be a while though, until I have more experience

UPDATE: My fish have finally started taking fish food. After around seven days of nothing to eat they decided (with the guidance of the sunfish) it was time to eat. My sunfish was attacking anything that dropped in. I also added 5 tiny feeder fish (that came from a amazing looking aquarium funny enough) and they were eaten immediately. Thank you everyone for helping me get started! Cant wait till I can try to do another tank! (probably be a while though, until I have more experience

glad to hear it, welcome to the native fish addiction.