1Filmproducer Fish Fanatic Joined Aug 7, 2011 Messages 68 Reaction score 0 Points 0 Location UK Sep 17, 2011 #1 What size heater will i need for a 40 gallon aquarium, watts please Mike
minnnt Fish Expert Joined Feb 26, 2011 Messages 12,060 Reaction score 0 Points 0 Location Nottinghamshire Sep 17, 2011 #2 200w would be a good choice. Usual advice is 1 watt per litre.