There is also the fact that often there is not a single right answer. I can tell you that if you want to eliminate ich from your reef you need to let the tank lie fallow for 6 weeks. Now, the length of time it takes to go through the different stages of the parasite's life are variable. So, if it goes through all the stages at the fastest rate you will have no viable parasites in 2 weeks. Your fish got ich, you put them in a hospital tank, treated them for 2 weeks and returned them to the
DT. It turns out that you were lucky and the parasite had also exhausted itself in your tank and your fish don't get ich again. Now you tell everyone that I am wrong, you don't have to let your tank lie fallow for 6 weeks, it is only 2 weeks. Who is giving bad advice, me with the worst case scenario or you with the best? I think this answer is pretty much a no brainer but there are lots of instances where it is not such an easy decision.
