Hey fellas, there are 2 types of organisms that are associated with "ich"...Cryptocaryon and amyloodinium sp....Both are very small organisms, obviously.. they will reproduce FASTER in warmer water...The free floating stage of their development can be slowed down with a good over sized UV with underrated flow.. Fish are more vulnerable when they are stressed!!... Quarantine can add to that stress...An alternative to chemicals is a freshwater bath for new fish... The tiny marine parasites cannot tolerate fresh water and will explode (osmotic reaction) long before any harm is done to the fish...Healthy fish fight off ich 24/7.....ES