What is this?

[Alisha218]

It looks like a worm with tentacles. Also what are all the things growing out of the sand bed?


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[rudy.guzman.925]

First is spaghetti worms. Second should be the same, cleaner crew basically- you may want to syphon out your sand or add more flow


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[Alisha218]

Is any of that bad for a tank? That's not in my existing tank but in a 150 gallon tank I am breaking down that I got from someone else. I used their live rock to start up my tank and I'd guess those worms would be on the rocks in the new tank...


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[mcgyvr]

yep spaghetti worm in pic 1and normal tube worms (if they have a feather like shape that comes out of them) or they are Spionid worms if you see 2 clearish tentacles sticking out of them on occasion.. I can't see the picture really well but I think its Spionid worms you are showing there in pic 2
All are totally harmless filter feeders and beneficial to a tank..

Here is a good site you should browse/scan for future reference.. It has most of the common critters we find in our tanks..
https://www.lionfishlair.com/hitchhikers-guide/