Are you actually fragging or purchasing frags?
If you're just purchasing them, to be honest, a lot of people don't even secure them to the rockwork - they just balance them or sandwich rocks around the base or whatever. It wreaks havoc when you have big, clumsy things (like massive turbo snails), but it's nice to be able to move things like when, say, your torch coral decides to triple in size and attack everybody.
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