It seems very irresponsible to introduce clownfish to your tank knowing that you have a predator in there that will make a snack out of them. It doesn't matter what you do to try and get the clowns into your anemone you still have to remove that mantis.
The only question I have for you is in regards to that anemone protecting the clownfish from attack. Who told you that they would be safe from a mantis in the anemone?
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^I just wanted that line^
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