Hello, I keep a fairly large flowerhorn in a 35 hex tank with a fairly small heater only a 100w it is placed vertical and set half power and it keeps that tank at warm 80+ so that is my only experience with small tank but my fish is mean and likes to dig everything up and thrash every thing that he can and with the vertical heater it get knocked off less. ************************************** Get a sneak peek of the all-new AOL at http://discover.aol.com/memed/aolcom30tour _______________________________________________ GSAS-Member mailing list GSAS-Member@thekrib.com http://lists.thekrib.com/mailman/listinfo/gsas-member