My discus have started showing ick and some other worrying symptoms please help..
I have 8 juveniles in my 55G planted tank.

symptoms:

1. They have white spots on their fins and bodies, not a lot but...
one has 3 spots on one lateral fin and 3 on its forehead.
two have a bit more spots on the bodies not on the fins.
2. they flick against leaves of plants
3. two of them are not eating from 3 days and look dark and hide at the corners (the same two showing ick)
4. Breathing seems to be normal
5. i see some web like threads on the leaves (like the ones mentioned in the plague sticky) .

other 5 juveis look fine now.


I've added about 5 heaped tablespoons of cooking salt in the tank and upped the temp to 31C yesterday, and have not fed them since yesterday. did a 25% waterchange day before yesterday.
other parameters as of yesterday are

pH 6.5
ammonia is slightly higher than 0

should i change water today and shoud i add some other medicines
i am trying to geta hospital tank but i'll be getting it not before tomorrow.

please help me.. this is my first time with discus.