What's thing?

nikon70

New member
I have two of these little guys that started growing...

Any idea what they are ?

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They are a common hitchhiker called ball anemones. They stay small and are pretty harmless.

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Thanks bud, happy to see them. I love the natural eco system thriving...

These worms are spreading well, the rock started with nothing, but after a year they started to pop up...

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These guys are rife in the bed, it's like a dance show at feeding time, they all come out and it's like the sand is alive :)

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I'm another one who appreciates what comes on the rocks. Those hydroids in the middle photo may give you trouble if you try to site a coral next to them, but they can be managed (or gotten rid of if you must)---and I have quite a few of those worms (below) too, and enjoy watching them go. Some want only what they've planned, but I like surprises in the rocks, and the only place I draw a firm line is caulerpa weed. If I spot that, I get the rock out and treat it, but all the rest I just enjoy watching.
 
encrusting white or yellow sponge is my fav hitch hiker..natural filter once it spreads to the underside of all your rocks ..
 
I've always gone out of my way to collect all the hitchhikers/pests for my tank. Some of them are even kept as if they were coral (majanos for example). I even keep the caulerpa in the sump, as I have 2 tangs that will dispatch it if they see it anywhere in the display tank. I'm actually so into hitchhikers I've been trying to find a particular one to buy! The only thing I can't ignore is aiptasia. They are a legitimate nightmare in a healthy, well-fed reef tank.

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encrusting white or yellow sponge is my fav hitch hiker..natural filter once it spreads to the underside of all your rocks ..
I have white, yellow, purple, and black! Not sure if there are any other colors, but purple is probably my favorite so far. :)

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