Gradual...
If he looks like he's a goner right now... be very gentle and do the drop slowly,(days...) otherwise.. he's for sure a goner. It will severly add to the stress IMHO. If you just did a drop from anywhere from 1.023-1.026, and put him in 1.009 after only acclimating for 3-4 hours, I doubt he'll make it. That's my opinion.
Good luck
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20g BB Mixed Reef // Coralife 150w HQI // AquaC Nano // Koralia 1 & Seio 820 // Jager 200w // AC50
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