6 inch 25 watt is for a 5 gallon, i dont see why it wont work for a 6
gallon.
i believe the brand is Penn Plex , try doing a search


"Leopold" wrote in message
om...
What is a good reliable heater for a 6 gallon tank? It seems that most
heaters are designed for 10 gallons and above (50w)?
And while I am at it..what's a good online fish store around now?
Thanks!!