What did you use /how did you treat the Ich?
A tip is to keep the temp for the fish at the recommended number for they kind of fish you are keeping.
Gravel vac on a regular for awhile as .
Keep up on weekly pwc
amount depending really, on filtration, stocking and type of fish.
When doing water changes try and get the water the same temperature as the tank water, make sure it isn't cooler than the tank water.
Make sure to never wash /rinse the filter media in chlorinated tap water - always rinse in clear tank pwc
water or treated tap water.
If you used medication, or a salt and heat treatment, just continue with the recommended pwc
's if using meds, and otherwise just keep up water changes with out using additional salt (or meds if treatment is completed).
And add in an extra pwc
every days to get the medication /salt out of the tank (for a couple weeks) and watch in case the Ich returns.
Make sure to keep the water quality as good as possible, and quarantine new fish purchases, to help keep disease out of the tank.