Originally Posted by erichm20
I talked to a marine biologist at my lfs
on the ich subject and he is a firm believer it exists in every tank and is only a problem for fish that have low immune system or stressed so just do what you can to keep stress low...
I disagree that it exists in every tank. If I set up a tank, use my own RODI
water, use dry sand, base rock, etc. then I take a captive-bred fish or I QT all fish and have my QT hypo, how can Ich be present? It does not magically appear out of thin air. Most people do not do that, so it very well could be present in a lot of systems.
I do agree with it being more of a problem for fish with lower immune systems and that less stress is good. That really goes for a lot of saltwater ailments. That is why people talk about putting fish in appropriate sized tanks. Small tanks cause stress. Aggressive and/or territorial tankmates can cause stress. Out of whack parameters can cause stress.