I love my tuxedo urchin but it is also the reason I don't frag cause it likes to take them on scenic tours however if the frags are on egg crate I've seen them zip tied in place and if on the base of the tank I've seen plugs placed in weighted flat material (flat rock, thick plastic base drilled etc...) then either glued or zip tied in place.
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 My aquarium is nothing but a smorgasbord for my cats.....
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