OP, I think you have to make up your own mind. I qt to rule out velvet, like Marie I have achillies, 3 regal angels and a copperband so I care enough to qt all new fish. As for ich, its just a parasite so of course it doesn't have to exist in our tanks but is extremely difficult to avoid, all new coral, rock etc would have to be in qt for 3 months IMO and all new fish treated with copper or hypo. I use copper on hardy fish and hypo on delicate ones. Good luck
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