 Re: Sea Slug???
never seen a flatworm bigger than a matchhead maself. sounds like you got a hitchhiker of either a nudibranch or a sea cucumber, google these and see if you can find a match to what you have. ID and research it, either one can be both benificial and dangerouse to your tank.
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Don't blame when I'm wrong, remember I'm just echoing what I've heard...
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