Case in point.
You do need to quarantine. Marine diseases are simply not LIKE freshwater ones in practice, although technically very much like them in theory.
As for that other stuff, some you need, some you don't, and again, it all depends on what you are trying to accomplish. Oh, sure, you can try to get by without some of these things in those systems where you shouldn't, but you'll probably regret it. Why do it the hard way when you don't have to?
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