How would you rather be treated, if you've been stored at sub-zero temperatures in a foul environment, and are within five minutes from death? Do you want to be gradually thawed or brought back to 72F asap? In the case of an emergency scenario like this there is really no choice, but for anything other than this it is better to be careful. An abrupt change of conditions in any direction can cause a lot of harm. Under stressful conditions the physiology of a fish will have adapted to try to compensate, and a sudden alteration may overwhelm what is an already compromised system. Pete. ------------------------------------------------------------------------- This is the apistogramma mailing list, apisto@listbox.com. For instructions on how to subscribe or unsubscribe or get help, email apisto-request@listbox.com.