what are you using to test salinity? even with refractometer, make sure it is calibrate correctly. I learn that SG may be quite lower than what you read. So yours may be even lower than 1.022. Try slowly bring it up to 1.025-1.026.
i saw a similar one in tang daddy's tank. it is sitting in the sand bed but lot of direct light. i am not sure if his lights are 250W or not.
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