How big do those squat lobsters get? Will they eat fish?
These particular Squat Lobsters are known as 'Crinoid Squat Lobsters' (Allogalathea elegans). The body size is around 3/4" long and 1/2" wide, and with claws fully extended maybe 1-1/2" total. Being small and slow, I couldn't see them doing any harm to a healthy fish, even a small one (one of my Green Banded Gobies is only 3/4" long and he's been just fine). They tend to tuck away during the day, but get much more active at night.
There are many species of 'Squat Lobsters', though, and some get much bigger. One of my favorites is the Red Galathea Crab which gets to around 2-1/2" long with claws fully extended. I haven't heard of this one going after small fish (possible?), but it is much more active during the day. They are excellent at ridding the tank of Bristleworms.
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