Suggestions:
1. Assuming you have an auto-topoff, measure the salinity decrease to calculate the volume of your leak
2. Orca underwater glue (available at J & L) is supposed to glue and seal underwater. I don't know how well it works, I keep a tube on hand
3. If it were me I would temporarily re-plumb to a rubbermaid or similar sump then take the sump out and either repair it properly or replace it
4. Not knowing the layout of your sump, you could even (temporarily) put a mini-sump inside your sump (ie. a bucket just big enough for the drain hoses to go into and to house a return pump) if you are worried about the leak worsening overnight
Best of luck
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120 gallon sps/anemones/LPS reef since 2004
Apex controller
8 x 54 watt T5 PowerModule
Herbie's silent overflow system
Jebao DC 12000 return pump
Jecod CP-40 Cross-flow circulation device
Mini Bubble King 180
Barr Aquatics calcium reactor
Bucket fuge
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