What do i do with fry tank?

I have 7 day old Betta fry the tank is nasty . I have an air pump. I have a filter but its not on i think it will suck the fry up.i have tried a turkey baster but i suck my babies up every time. i think if i just leave it the fungus that's growing on the uneaten food and dead babies will kill off the fry. what do you think i should do ?