Hi Stacy.
As you might already know, no chemical treatment affects the ich whist in the white spot stage of it's life cycle.
So initially I slowly raise the temp to about 82-84f. This speeds up the ich life cycle and the free swimming ich stage has much less time to find a host. 86f will render the ich unable to multiply but I have found 82-84f effective.
Drop your water level enough to cause your filter outlet to agitate the water surface as oxygen saturation is less at higher temperatures. Small water change regularly paying special attention to the gravel, the white spots drop off the fish and sink to the bottom where they multiply. Many will be syphoned out. Keep the temp high for 10 days after the last sighting of the white spots and slowly drop back down to your normal temp.
Your plants should be ok with this. A few will not like higher temps but should be ok for this relatively short time.
I don't use chemicals so can't comment on their effect on plants.
Best of luck. Steve.