The fish appear to have a bacterial & fungal problem, but it is not safe to medicate with nitrite showing up in the water. The best thing to do right now is to keep up with the water changes, decrease the feedings (every other day what the fish can finish in 1 minute), and give the tank a chance to complete the cycle. If we medicate now, it could be lethal to everything in the tank.
I will agree with not overdoing the biospira, too much of a good thing is no good. Time is the only thing I can suggest at this point, and keep water testing, every day to every other day. Once the water quality is in the clear, I can suggest an effective medication that should help clear up the rest of your problem.