I put simple acrylic covers on my tanks in my classroom . They are not locked down but it would be a very easy fix to epoxt yhe frame to the tank and add a lock.
On that note I have never had an issue with hands in the aqaurium in either my mantis tank or with my foxface. The kids love the tanks though.
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Biocube 29 est 05/05/08, Koralia 1, 30lbs live rock, ,yellow tail blue damsel, pair cinnamon clowns, baby snowflake eel,Toadstool , metallic green mushroom, assorted zoos , kenya treen
180gall display, 190 pds live rock, virgate rabbitfish,bluejaw trigger, bubblletip anemone,yellow tang, sailfin tang,melanarus wrasse, cloud wrasse,
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