That's a Salinity of about 31ppt. Oceans all over the world that support reef animals have a Salinity of 35 - 37ppt. Most are 35ppt. The S.G. varies all over the place depending on the season but Salinity very rarely changes (except Lagoons).
IMO, that means the animals you are keeping are not physiologically adapted to the Salinity you are keeping them at.
I would suggest getting your water to a Salinity of at least 35ppt.