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The frag has been in the tank 5 weeks but the snails have only appeared in the last week. I didn’t recognise them till yesterday as they weren’t really visible. Can’t see them anywhere else but the frag so might remove that and try get them off.Yes, vermentid.
You can research the hundreds of threads on them. Very difficult to get rid of. Some say impossible.
If you just added the plug in the last hour or so, I would quarantine the plugs and corals immediately. Manual removal with a knife. Wait a couple months in qt to make sure they dont come back.
If it’s been days, it’s already too late. No point in removing the corals now. However, there’s always the chance that they were already dead, and those are just empty tubes (unlikely with so many). Look for a mucus string coming out of them. You can try manual removal with a knife in tank, but dont just crush them, try pop them off in their entirety from the bottom and remove them from the tank.
Look carefully at the rest of the rockwork. Incredibly unlikely they only grew on that plug.The frag has been in the tank 5 weeks but the snails have only appeared in the last week. I didn’t recognise them till yesterday as they weren’t really visible. Can’t see them anywhere else but the frag so might remove that and try get them off.
My rocks are white/green as is the sand which is why they stuck out so much on the frag. So would be easy to spot. The frag had some more snails underneath it. I’ve taken it out to inspect as it wasn’t glued in.Look carefully at the rest of the rockwork. Incredibly unlikely they only grew on that plug.
They grow on rocks, pumps, filtration, skimmers, overflows, pretty much anything. They broadcast spawn and grow where they land. They didnt all happen to choose just that one plug. I would keep it in there, as you probably have hundreds more.
Many say they start out microscopically small. They normally don’t grow on sand, but do on rubble.My rocks are white/green as is the sand which is why they stuck out so much on the frag. So would be easy to spot. The frag had some more snails underneath it. I’ve taken it out to inspect as it wasn’t glued in.
Yes started with dry rock and sand four months ago. The coral isn’t growing at all anyway as I bought it not knowing it’s for more advanced tanks.Many say they start out microscopically small. They normally don’t grow on sand, but do on rubble.
Looks like dry rock, so they probably came on that frag plug, and those are just the large ones you can see because they grew for 5 weeks. You can pop the coral off the frag plug, and try get any left on the coral, but I think it’s already too late. No point in tossing a coral if they are already on the rockwork.

