A few questions that haven't been asked. Was is true "cured live rock in your tank or dry base rock? If it was cured, you shouldn't be going through a cycle even being a bit under the recommended 1 to 1 1/2 pds per gallon. If it wasn't cured live rock, your going through a cycle and your damsel will not survive in a tank that size. There will be to many swings in your water parameters due to size.
Did you add the Damsel at start-up based on advice from your LFS? If so, find another LFS.
Do not add any other live stock until it's detemined that your tank is or isn't going through the cycling stage. Especially inverts.