Diy crab trap - advice needed

[Evanboi]

Hi,

 

Hoping to get some advice here. I spotted a hitchhiker crab at the bottom of my rock structure and tried a couple times to get out with my diy traps but failed. Trying the tilted glass/bottle method using a shrimp meat (attached photo) but usually the next morning , the meat will be gone, sometimes with some sand grains in it so something must have went it . Don’t think my cleaner shrimp was culprit cos I’ve never seen it successfully enter the opening which is slightly less than 2cm. Probably not my 2 Trochus snails too. So i think the crab could have eaten it and managed to get out . In my latest setup, the glass is pretty slanted , What could be the issue ?

 

 

 

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[kakak99]

Take rock out, use pincer to remove the crab?

[Evanboi]

Take rock out, use pincer to remove the crab?

Mm I don’t really know exactly where it’s hiding and it had been quite fast the few times I spotted it. I think taking the rocks out will be the last resort .


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