Most folks' go-to treatment for ich would be 30 days of copper - but there's a catch.
Liverock can absorb copper, bringing the levels of copper in the water below what will kill the parasites. Once you've ended the treatment and removed the medication, the rock may also _leach_ copper into the water, making it a challenge to _ever_ keep any corals or inverts in that tank.
Daily testing to ensure that copper levels are within the therapeutic range (both range and test kits differ, depending on whether you choose ionic - ex.: Cupramine or chelated - ex.: Coppersafe forms of copper) is recommended, but if you're doing it in a display with liverock, you might consider testing both morning and evening.
~Bruce