Found this in my live rock

[randomfishdude]

Im sorry WHAT. These monsters break glass??? I knew about the punching rocks and killing fish but breaking the glass? Yep nope makes me even more terrified of them

Yea there's some videos of them breaking glass vials and stuff.
I belive they have also broken or cracked tank walls before.

I'd haft to fact check it but I belive they do.

 

[mizimmer90]

There are spearers and smashers. Both will eat your fish. Check out this article (theres a video at the bottom where they slow mo show them spearing fish and yanking them into their burrow) https://aquariumbreeder.com/mantis-shrimp-as-an-aquarium-pet-care-guide/

 

[littlefoxx]

Yea there's some videos of them breaking glass vials and stuff.
I belive they have also broken or cracked tank walls before.

I'd haft to fact check it but I belive they do.

Yeah thats a big fat nope get that thing out if I were you OP!

 

[ISpeakForTheSeas]

These monsters break glass??? I knew about the punching rocks and killing fish but breaking the glass?

It’s extremely rare for mantis shrimp to break glass - it can happen (and has happened to some unlucky people in the past), but my understanding is that it basically only happens if there’s an issue with the mantis’ burrow that leaves the mantis trying to expand its burrow by digging through the glass (which they attempt to do by repeatedly striking it), or in unlikely accidents, such as when someone unintentionally baits the mantis to strike at food outside of the tank. Again, it’s extremely rare, but many people recommend acrylic tanks for mantis shrimp specifically because of this issue.

what harm will they cause

As mentioned, there are spearer mantises and smasher mantises - the spearers specifically hunt fish while the smashers typically hunt shelled inverts (such as snails, shrimp, crabs, etc.); they are fast and dangerous hunters, and pretty much anything put in a tank with them has a good chance of being killed.

 

[mizimmer90]

Careful putting your hand near the burrow

 

[Nicksreef2022]

I have just removed the rock with the mantis in it .

 

[Townes_Van_Camp]

I have just removed the rock with the mantis in it .

I get one every time I buy more than 4 dozen bait shrimp. Usually I think someone on here may want it. Then I just say "na..." and toss it in the water.

 

[Nicksreef2022]

Caught it

 

[jason2459]

They are well worth a dedicated tank. Get a good side view picture and it can be identified.
Dr. Roy was a huge help to the stomatopod world

Roy's List of Stomatopods for the Aquarium

I kept a G. chiragra in a 20g long for close to a decade before it died of old age. I also had a yellow tail damsel in there with him the entire time and still have that fish now in my 120g. I also had pulsing Xenia and Zoas.

They are so much fun to observe and feed. They have great personalities.

 

[Nicksreef2022]

They are well worth a dedicated tank. Get a good side view picture and it can be identified.
Dr. Roy was a huge help to the stomatopod world

Roy's List of Stomatopods for the Aquarium

I kept a G. chiragra in a 20g long for close to a decade before it died of old age. I also had a yellow tail damsel in there with him the entire time and still have that fish now in my 120g. I also had pulsing Xenia and Zoas.

They are so much fun to observe and feed. They have great personalities.

 

[PeterEde]

Depends on species. Hammer or speaker.
Hammer will kill inverts speaker will kill small fish

 

[jason2459]

I think I see a purple spot outlined in white? Like a G. smithii. If so that is what I originally wanted and absolutely great pets. Would do great in a dedicated 20g long tank.

g_smithii