Get it out....it's dead.
Why are you running carbon and phosban?
Not that there's anything wrong with it,but algae problems?
If it doesn't stink, then IMO yes put it back in.
It should smell a little funky as most corals do, but if it's rotting you will know it right away. Just like smelling milk, if it's bad it'll make you gag. If it smells OK, then it's just shriveled up and I would put it back.
Also, just to check, you started running a GFO type phosphate remover, not an aluminum based remover, right? (GFO is brown, aluminum would be white)
The product is seachem phosguard and it is small white pellets. This tank does not have a sump, so I am running a canister filter (with no mechanical sponges) for flow and carbon media. That being said, this was the product recomended for that setup?? Is this product not safe to use?
This morning the toadstool looked worse than ever, so out it came.I cannot risk the whole tank for it anymore.
OK, there's the problem. I don't recall all the details, but aluminum based phosphate removers are known to frequently seriously annoy some soft corals. I don't think anyone ever figured out why, but IIRC it was seen quite often.
I would strongly suggest tossing that seachem stuff and replacing it with a GFO based phosphate remover. I'd also run fresh carbon in hopes of taking whatever irritant may be in the water from the aluminum based remover.
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