I second checking your sump.
My first BTA somehow went thorough the slits in the overflow, through the 1/4" holes in the drain pipe, and down into the sump where I found it some time later.
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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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