Travis,
What kind of lighting do you utilize? Montis and zoas should be able to survive just about any lighting scheme and very low output. An old or poor quality bulb of the wrong spectrum would encourage nuisance algae but shouldn't outright kill your corals unless they are extremelly reliant on high PAR readings like acroporas.
Try different test kits to see if your getting the same readings on your parameters. Something's outta whack? Lighting alone IMO shouldn't be killing these corals.
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