How did you cycle the tank? Did you use fish to cycle it? Did you use these fish to cycle it?
Have you lost any fish?
Are the white spots salt like in appearance and spread out over the body? Or are they more concentrated in certain areas and cottony or fuzzy in apperance?
Ich isn't usually that hard to get a grip on.
I've never used Rid Ich, but I can tell you from experience that the package recommendations that come with the meds never cover the full life cycle of the parasite, so you always have to treat longer than the medication states, but you should be seeing some improvement after a couple of treatments.
I would go with meds OR salt/heat, not both, since it can be too stressful on the fish, and both aren't necessary. You're going to need to squeeze in as many water changes as possible, since they will aid in removing the parasites from the water in various life cycle stages. Keep the tank darkened and as stress free as possible, and continue to treat the tank for 4 days after you see the last parasite fall off the body.
Are you aware that these two fish won't work in this tank long term? Bumblebees need a 75G minimum - they are one of the larger and more nasty mbuna, and frontosas need a 6 ft tank long term, and will eventually grow large enough to eat your mbuna if you add more.
Stock choices play a huge part in the stress level of the tank, although in this particular case, I think you're dealing with typical new tank problems, but it's something to give serious consideration to as you stock the tank in the future.
I'd be willing to bet that improper stocking leads to over half the frustration for new hobbyist.
Kim