I have ran 1 1/4 abs in my sump for 3 years with no ill effects. I think its only the abs glue that is a little more toxic. After all all the bulks heads we use are all abs.
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360 gallon sps reef, 180 gal sump, bubble king supermarine 300, 4xmp40Wes, 2 x 6215 tunze waveboxes, 4 ghl mitras
360 Reef Tank
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