Need help with id

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marcwjj

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Just got these off live rocks, are these good or bad things for my tank? Thanks!

(the crabs are tangled with anemones, they are not hairy)

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The only thing I would personally keep is the second picture; looks like a spaghetti worm. The crabs would probably go in my sump and the rest would be tossed out. The 4th picture doesn’t look like a typical bristleworm...
 
Rocks are all in water now cycling, what are these things called? Thanks!

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this looks like a snail or conch? With red body?
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Cactus looking thingy ?
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i I guess another harmless snail?
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Looks like there are 3 types of algae? Coral?on one of the rock, have no idea what those are but look amazing to me :)
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Oh, it does look like a horse conch - he's very active in the tank right now. All the other critters are hiding in the rocks and nowhere to find...

I ordered 15 lbs from KP aquatics, they shipped them in water and arrived overnight this morning.

The life diversity is simply awesome! Also spotted a few pretty big brittle stars , some smaller crabs without black tips (which I assume they are good), and some tiny shrimps which look like snapping shrimp.
 
What's the size on that Eunice worm (4th picture)? They can be aggressive to anything they can wrestle into their dens. Small specimens are basically detritivores. Larger species of Eunice worms eat fish and anything else. If you want some nightmare fuel, watch these two videos:
 
What's the size on that Eunice worm (4th picture)? They can be aggressive to anything they can wrestle into their dens. Small specimens are basically detritivores. Larger species of Eunice worms eat fish and anything else. If you want some nightmare fuel, watch these two videos:
Yuk... the eunicid worm is about 3 inch long, I'm leaving it in my breeder box for now with the two gorilla crabs. is it going to grow into one of those bobbit worm? Anyway I don't want to take the risk to put it in the DT.
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Feather duster in the first pic, second could be a horse conch. not sure on the rest. Looks like very nice rock!! Where did it come from?
Btw , is the horse conch bad? Another reef said it could be whelk and is bad.

I don't have any fish or coral now, but I want to get some soft corals and anemones eventually, should I leave it there until later ?
 
Btw , is the horse conch bad? Another reef said it could be whelk and is bad.

I don't have any fish or coral now, but I want to get some soft corals and anemones eventually, should I leave it there until later ?
Both are predatory and not something I could keep, personally. A horse conch can grow to 2 feet long.
 
Yuk... the eunicid worm is about 3 inch long, I'm leaving it in my breeder box for now with the two gorilla crabs. is it going to grow into one of those bobbit worm? Anyway I don't want to take the risk to put it in the DT.
MVIMG_20200905_195726.jpg
Its hard to tell, I'm not an expert in identifying Eunice worms, and I don't know anyone who is. Wouldn't hurt to see its growth rate over time, see if it starts to really take off. Bobbit worms have a relatively short lifespan (~5 years max) and so it would be large- greater than 1 foot- within a year if it is a giant Eunice worm. I definitely wouldn't put it in the display, but it is something I would put in my refugium if it stays small. I prefer having a large biodiversity in my refugium to keep the display fed with variety and for greater stability via biodiversity. A field of wheat is nice, but doesn't survive predators/disease as well as a full ecosystem.
 

IF YOU HAD TO TAKE A REEFING EXAM, WOULD YOU PASS?

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