aquarisol is a copper based med, so it will leach into the silicone in your tank and your tank may never be safe for snails or shrimp (the copper will leach back out of the silicone over time).
i'd be doing as large a water change as you can every day (meds break down quickly in water), along with a really good gravel vacuuming every day (to remove cysts from the substrate). try for 75% water change or more if you can. redose the aquarisol for the amount of water you are putting back into the tank. so if the dosage is 12 drops per 10 gallons (as per the bottle instructions), then dose only 9 drops if you have done a 75% water change.
and be sure to remove any carbon from your filter. if your filter is a cartridge style that has carbon in it, just pull out the cartridge and put a chunk of sponge in there. i would leave the sponge in after you're done medicating and not bother with cartridges at all. they're a waste of money and not very effective IMO.
hope it clears up for you! i've only had to deal with ich once (knock on wood!) a couple years ago on a female betta housed by herself. i also used a copper based med (Ich Guard i believe) and it worked really well. the fish was housed in a large bowl with no heater so i treated at room temperature.
be sure to continue medicating for at least a week (some say two weeks is best) after you see the last cyst fall off the fish. terminating medication early can bring the ich back stronger than before.