For emergency QT, a seeded sponge is good enough provided it has been inoculated thoroughly (3-4 weeks). It can also be augmented with a product like Bio-spira, along with porous media in a HOB filter. I've used Bio-spira countless times and have never had an ammonia issue in QT. It's one of the few "bacteria in a bottle" products that actually works.
"For emergency QT, a seeded sponge is good enough provided it has been inoculated thoroughly (3-4 weeks)."
It is more correct to say that in an emergency this may be all that is available.
Whether the sponge has enough bacteria depends on where it has been in the tank (how strong the current is and how oxygenated it is relative to elsewhere), how big it is, and what the bioload is in DT in comparison to the bioload to put in QT. It is one big unknown.
Packaged bacteria is useful in an emergency, but an aquarist should have anticipated such emergency and be prepared.
In general, seeding the medium for Qt is just that; often, usually, it is not enough. I even think this is the basic problem for many newbies.
Your problem is relatively simple since you have only a clownfish left.
You can do your best to support your clownfish with whatever medium in your DT, and treat it to eradicate ich in a separate container with such medium from the DT.
You basically need to leave you DT fishless for the next 12 weeks. This is all the treatment needed as far as the DT is concerned
Meanwhile, you should start a cycle for the medium for QT ASAP, first for the clownfish and later for new purchases.
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