the 'natural' remedy i heard said add aquarium salt (not marine aquarium)
i dont' recall how much salt.
from what i remember of the reasoning was fairly simple
raising the temperature increases the metabolism of the ick
there is a stage after eggs are laid that the eggs are impervious to anything, no medications will touch them
raising the temperature causes the eggs to mature faster, after they hatch then they're vulnerable, ... then they search for our fish and we get to see the distinctive white spots :(
i've had ick in my tank 2x, i resolved it both times with this
add salt (look up online to find out what the recommended amount is, ... i think it's one tbsp per 5 gallons, ... i have heard some plants don't like this, i didn't notice any suffering in my plants, ... doesn't mean anything, i only have a small variety of plants.
the salt is supposed to cause the ick parasite to die, the temperature increase causes the metabolism to work faster so they hatch sooner, and the salt is supposed to cause them to die.
if your only raising your temperatures, ... then ... the ick parasites hatch sooner, find a fish, have eggs, the egg sacks fall to the bottom of the tank, the eggs hatch sooner, ... and your compounding your problem instead of solving it.