I'll go ahead and plug in-line heaters right now. Mark Dorward turned me on to them and they work great. They are out of the tanks so they are less unsightly, they are much stronger and reliable too. This is the one I have on all my tanks. http://www.drsfostersmith.com/Product/prod_display.cfm?c=3578+3743+11369&pcatid=11369 On Dec 7, 2009, at 2:15 PM, Hostetter, Kypros wrote: > I have struggled with heaters on one my tanks, when it gets cold they can't > keep up, _______________________________________________ GSAS-Member mailing list GSAS-Member@thekrib.com http://lists.thekrib.com/mailman/listinfo/gsas-member