I have had and currently have items 3,4 and 5
All are harmless to your tank as far as I know.
The exception is the limpets my yellow tail damsel had a craving for them(it left everything else alone but damn it went after them like crazy) and they no longer exist in my tank or if they do are hiding from my damsel in places it can't get.
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 My aquarium is nothing but a smorgasbord for my cats.....
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