Ok there is little science to back up your claims. You have taken bits and pieces of truth and twisted it.
otherwise you can explain why in the same tank some fish are affected more than others
Ummm because some fish are affected more then others. Different fish have different make up. For an extream example, take a sunfish (Mola Mola) for example. It is one of the worst carrier of parasites due to its soft body tissue that makes it easier for parasites to grab hold. A shark on the other hand, does not have to worry about parasites!
Only sure method of erradicating, is to not have any fish for an extended period of time, not in the main tank, not in QT and not in anywhere in your house.
Huh?!? I file this comment in the catigory of a comment like, "All fish tanks have Ich, it hitch hikes on live rock or from another source and there is no way to get rid of it! Neither of the two make sense to me!
Just because you don't see any exterior signs doesn't mean they do not have mild infection, in their gills.....
it doesn't mean the new fish you bring in isn't carrying the parasite. They can go without any visible signs in QT for a long time....
Agreed... Gill infestions are common.. There are signs to tell of gill infections but it is hard. But this is why I recommend that a person run a QT at Hypo and give the fish a FW dip upon arriving to the QT tank. These two practices are safe for the fish but will remove most if not all external parasites before the fish get into QT. Furthermore, the parasite will hitch hike in the gills but with propert QT and observation, the parasite will not remain there and you will see exterior body signs within a months period of time.
Golden rule on tackling parasites is not erradication but controlling them with proper husbandary, it goes a long way
Again, HUH?!? Whoes golden rule is that?!? I surveyed 100 PETA members and 99% of them agreed, parasites have to go, kill them all! (We killed the other guy for being stupid, FYI!) So if they did not make this "golden rule" then who did?!? I will agree, husbandry does go a long way but will mnot "control" parasites. Again that is you saying that if you keep the fish healthy, you are making it immune from attack or atleast able to fight it off itself. It wont happen, it is not an immune system thing. I will take the modle of health, you know the person that eats wheatgrass becasue it is a cure all for everything. Sure I will agree that there might be something to the claim that they get sick less then a normal person. They might be able to fight off the flu more then a normal person. Now let me take them to South America and get them to drink the water and eat a few tape worms. You want to talk about on sick hippy! The parasite has NOTHING to do with immune system!
Only use meds when fish shows excessive infection.
Define "excessive"... I will agree, and have said many times, that meds are a last resort when other treatment options have failed. If you have cancer, your doctor might allow you to try all the healing crystals and herbal teas you want, but if they do not work, surgery and radiation are in your near future. It is alright to try other methods but until proven, be prepared to step in with things that have been PROVEN to work.
Because 9 out of 10 times, all the meds and treatment makes the fish to stop eating and you have more issues in your hand than you started with.
Ok this is my THIRD "Huh" of this reply, I think this is a new record!! First of all, where do you get 9 out of 10?!? I have treated over a hundred fish now (thanks to the members on this site) and I have loss about 14%, mostly due to a weak fish in the first place that might not have survived before hand so i can not chalk that up to the treatment. Second, the most I have seen a fish go without eating after treatment is about a day and you should not be trying to feed them for that day anyways. I just dipped 6 fish suffering from Brook and Ich (both), the Tomato clown was not eating for a few days prior... I used a double dose of Formalin for a 50 min dip in SW. EVERYONE survived (from the large tomato clown to the small clown goby) and within the next 24 hours the Tomato was eating like a pig again.
You come up with hard science or some fact to your statements and I will stand behind them and test them. But your last two posts were based off of hearsay and twisted science, pulling excerpts from larger studies to suit your own needs. Not only is that dangerious advice to give another hobbiest, but also dangerous to the fish being treated. If I can offer some reading on the subject it would be Ed Noga's book: Fish Disease: Diagnosis and Treatment. It is about the best reference on fish disease and pathology out there. A bit of a hard read but well worth it.