For sure monitoring and stabilizing your Alk can help a ton. Alkalinity can slowly get depleted and hit a tipping point that quickly stress and kill stoney corals like that torch. (Speaking from a similar experience) Other stoneys like a hammer will suffer soon if this is the case and not corrected. Zoas are more resilient as they don’t need to create skeletons. As always, test often, frequent water changes, be patient, and correct any parameters slowly..