somehow you got bad silicone or there was something used to clean the glass that was still on it when you started using the sump - after the repair.
you need to get that sump out of there, tear it appart, clean the glass and rebuilt it using the right silicone, also let it dry before you install it, do some water changes and hope your tank makes it - run carbon.
You could take a hit and just sell off the corals AS IS at a loss....
When you are done building the sump again, use the left over water from a water change (healthy tank water) and buy a $5 chromis and put him and the old water from a change in the new sump to see if he gets sick or not. Better to do that than loose everything again.
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