+1 to rygh. Catalina's are a subtropical fish, but, let's face it, 60-70 degrees in a reef tank is cold. Again, matter of thriving vs. surviving. How do you know that "she" has finally reached her limit in stress? Water is too warm and she's in the overflow. I don't care if you QT or not, any stress like that can cause illness or crypt. I mean, doesn't crypt live on the fish in the gills anyways? It only attacks when the host gets too stressed and their immune system is low? I went thru crypt (ich, I use them interchangeably even though I know they're different). With my fish and they were miserable = / Like someone told me in my thread: if they eat, feed the hell out of them and keep up on water changes. Also, Jim mentioned to me that beta glucan helps bolster fish immune systems. I wholeheartedly agree with this after using a feeding regime of food soaked in garlic, beta glucan, selcon and vitachem. My freezer is also almost totally dedicated to fish food xD they eat better than we do, but I believe the variety and vitamins help. I tend to swear by beta glucan and garlic. Beta glucan does seem to help their immune system, and the garlic, when fed enough, seems to act as a natural repellent; ie you take garlic pills when living in Alamaba for long enough, the mosqitos tend to avoid you. This is what we did as kids and it worked great! I apply that theory to the fish and it seems to have worked well for me. I hope this helps you a bit. Start fortifying their food and doing huge water changes or take them all out and run fallow for 2-3 months.