Is it safe to take a multivitamin, probiotic, fish oil omega-3 supplement, apple cider vinegar, and psyllium husk for fiber together daily?

Yes. These are safe though I wouldn't take them all at once. I advise the multivitamin after breakfast, the probiotic at the start of a meal, the fish oil after lunch or dinner, apple cider vinegar in water separate from meals and the psyllium at bedtime. Some multivitamins are far better than others- see and