like UWA pointed out, it'll be random with something like a trigger. Ive heard they stick to plakton too tony, but you never know with triggers right?
btw tony, if you get a small mantis It'll be just fine really. smaller species are even considered reef safe. A mantis can move rocks/frags about 1.5 times their own weght maximum (probably an overestimate on my part anyways). So if all your frags are down tight to rocks the mantis can't budge, your corals are safe. Now which mantis? well keep to the small ones like G. viridis, N. wennerae, or G. smithii. Stay away from G. chiragra and O. scyllarus (peacock). note that lfs almost never ID mantids properly. I got a g. smithii in my 8gal reef-to-be.
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