I feel like if you’re depending on a maintenance company to do all of your testing and maintenance, you probably should just have a FOWLR tank. Keeping corals is too demanding and too much of a hands on hobby to depend on someone who comes by every two weeks, who doesn’t observe the tank daily, and who can’t trouble shoot in real time. There is a disconnect here, when troubleshooting, should we be talking to the person who maintains the tank and has the knowledge and ability to test and take action, or the person who observes the tank each day? Neither person is in an ideal position to help these corals recover.
My suggestion, and I don’t mean to sound harsh, but it’s just what caring for these animals entails, would be to start caring for the corals yourself or switch to FOWLR. It wouldn’t be acceptable if you were keeping any other exotic animal if you had someone come by every few weeks to take care of it and you were unable or unwilling to do anything to help it between maintenance visits if it’s health took a turn for the worse. Again, don’t mean to be harsh, but these are living animals, if you want to keep them, they really need someone in the house that’s there daily that’s able to test water and properly troubleshoot when there is an issue.