Love your post @Paul B. As you might already know I have been keeping reef tanks for 35+ years and I have been Scuba Diving for 40 years.
So your a Geezer like me.
My experience has been that the best looking and healthy corals are found in the most pristine water.
So while I think a "dirty Tank" is great for FOWLR use I am not so certain I would go that route with a tank that has SPS and LPS corals in it.
I don't mean "dirty" water. I mean water that is aged, not dirty. Yes, I know I said water was to clean but I mean water that is not new ASW right from our RO/DI unit as it doesn't have the right compliment of bacteria and natural substances from algae and other things. That is why new water is not healthy.
My tank water is pristine and very clean. Most of the diving I did in my life was in New York where the visibility is measured in inches, but I have dove all over the world and in Tahiti where it is all SPS you can see the bottom very clear at 120'
I also agree with a many of your concepts...except I will say that our tanks lack something that the ocean has in it's favor: Scale.
A fish that might come across ich in the ocean will have to fight it off and move on with his fish life. In our tanks, that same fish will then be re-infected again and again and again with greater and greater numbers. One cyst in the ocean landing on a fish is bad luck, but there is no escaping the countless cysts swirling around our tanks once things really take off.
WE can't help the scale but I hear that all the time about the parasites re infecting the fish because they have no place to go and it is a good theory. However, I find it not to be true. If it were, my tank would not exist. I think, and I can't read the mind of the parasites, that the fishes immune system will grow to as strong as it has to be to overcome a greater number of parasites. Remember, the parasites will constantly get weaker in a tank because they will be affected by the antiparisitic substances in the fishes slime so they can't grow to immense numbers, unless you quarantine or medicate to the point where the fish has no defenses and the parasites will take over and consume the fish.
As we read the quarantine threads look at how many fish die or get re infected while in or just out of copper. A fish like that is a prime target for a parasite, but a fish in my tank can't be infected so the parasites dwindle in numbers as they have been doing for decades.
Of course I want some parasites in there so the fishes immune system can recognize them.
Some of my fish are almost 30 years old and I add fish all the time as they die of old age or jumping out.
If the parasites grew to numbers to overwhelm my tank, I would not have a tank and I never lose fish to them.
These guys lived to be 12 years old and spawned constantly while never showing even one spot.
For most people, their best bet to keeping fish alive beyond the first week or two is treating things like ich/flukes/velvet with a more hands-on approach. I think one thing that has changed over the past 30 years is that more and more fish are coming in with truly bad issues. EVERY fish I've gotten over the past few months has had flukes.
I also hear that all the time and I got this little copperband a few months ago. As all my fish I put him right in my tank. She did have flukes and seemed uncomfortable for a week or so. Shaking her head and scratching and I knew she had flukes.
I could have fresh water dipped her but that is very stressful. If she was really bad I may have done that.
After those two weeks she is fine and eats everything. Inquisitive and bright eyed. My last one died at about 10 years old.
I believe the fish also becomes immune to flukes as this fish seems to indicate.
In the last year I may have added 7 or 8 fish. They may have had flukes, I don't know or really care as they are all still fine and will probably live for many years with no scratching or signs of anything but health. I think it is the lack of stress and what I call proper food.
This is all just my opinion of course, but for some reason my fish get over all of these things that seem to crash tanks and I 'think" it's the right combination of bacteria, parasites and viruses that the fish was born in an ocean with and needs to stay healthy.
Fish in the sea get flukes, but they don't die from them because the fluke leaves due to the irritation of the fishes immunity and looks for another fish where it has the same problem.
I'd be very interested in hearing more about your feeding practices, and how you supplement the diets with which type of live foods etc. I want to do much more of that and I could not agree more that those foods are the key to keeping these little guys happy.
I have a very long thread on hear about my practices but I can re hash it later after this thread winds down.
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