I am fairly new to using both of these tanks. I would appreciate any advice from people who have used them for awhile. How low do you let your tanks get before refilling them?? The Aspire nautilus manual says 0.5ml but I have also read you should refill at 1ml. Not sure about what the manual for Nautilus mini says b/cc I have just ordered & it is on its way. But I am pretty sure what Aspire suggests & actual users say is different. Thanks!