After a month, those seeds are beyond hope.
A humidity dome isn't necessary to germ, just keep the medium moist but not wet, and it can actually help create the conditions for damping-off (pythium) which will kill seedlings- air flow is important.
A nice thing about rapidrooters is that they are inoculated with beneficial soil bacteria and these bacteria prevent fungus from attacking the little plants. So if you are having problems, it's worth a shot.
Practice on bagseeds for now until you are certain that you have fixed the problem. There are probably some in your buddy's ashtray or the shifter-boot of his car...