Well I have heard of them pulling thru if they keep feeding,I just prefer to keep a UV . Its all personal choice and what works for you.
It would appear to be totaly different imo to the freshwater beastie that shares a common name with it. We actualy realy know bugger all about its life cycle what other things it can live on whether it passes thru inverts like snails?
Ive often thought maybe it can lie dormant in a cyst stage untill something like the chemical signals a stressed fish sends out trigger it to hatch?