@Humblefish - I would never say a diatom filter is a silver bullet, but rather a very effective
tool to achieve a long recognized but often overlooked reef-keeping principle -
Dilution.
I think Paul also is trying to emphasized another long recognized but often underappreciated
principle - nutrition. The oxydator, an H2O2 delivery system, as I understand it, is also a
tool and not a method. I don't think anyone - anywhere has refereed to these as silver bullets. Tools and principles have to applied appropriately to be effective. I'm sure you would agree quarantine is not a silver bullet if not applied appropriately.
@4FordFamily - I, like Paul have found through years and many, many tanks that I too can skip traditional quarantine without loss and for the long-haul. I do keep many (mostly) Tangs including the dreaded Achilles and Powders. I got into tangs while running a coral propagation system - tangs were workhorses in my systems keeping nuisance algae in check. Keeping corals and tangs together, I had to find a way to beat ich and velvet without the luxury of medication available to keepers of fish only systems. Dilution was the principle I found which made this possible. Not just in one system, but in every system I have set up. I can't claim this discovery - the use of DE filtration is used extensively in aquaculture and public aquariums. How it works is simple and well understood. Ciliates and dinoflagellates - and that include many diseases other than ich and velvet - and not just for fish, but for every other bit of livestock we keep in our systems, are big and can easily be caught in the most basic of filtration. Its a tool - and like every tool - must be used correctly.
Copper works - CP works - but these hurt the fish and are arguably cruel- why are you still using them? If you want to cry - visit the fish forum on this board - the method of quarantine and fallow fail all the time following the methods you prescribe - you would agree I think that a bit of expertise and practice is required to master the those tools.
Maybe you've tried filtration (dilution) - or read of someone who has tried and failed.
Just means you or they didn't know how to use the tool.
As I said - I do keep tangs - and do not find quarantine necessary - (not for ciliates and dinoflagellates or for many other parasites with a free swimming stage) - and I do and have put infected, but otherwise healthy fish directly into my DT. Now ask yourself - what would in you do is you woke up tomorrow and found Ich in your tank? It will happen to many. Tear down, medicate, hospital tanks, quarantine tanks and let your DT sit for 76 days. What if its not ich or velvet but brook or uronema - same but with bleach?
I don't think you could go 40+ years - do you?
@paul - I can't practice your methods but you've got me thinking and I can apply some of them to my system. Thanks for getting me hunting for new stuff in the right direction.