Hi all.... I've been away from the saltwater fish world for a spell and I'm after 2 years getting into keeping marine fish again. I was given a 12G nano Cube and I noticed it was getting a bit cold (74Â°) so i bought I small heater for the tank.I was told that a marine tank should be between 78Â° to 84Â° but I was wondering for all of you familiar with the nano cube setup if i was to setup the heater in the 3rd chamber where the power head is located so that when the powerhead pumps the heated water out it would evenly distribute the warm water and not to mention i also have bio-balls in there. will it kill the bacteria forming in the Bioballs or in that section of the tank and is there any negative effects to putting there instead of in the main vewing area in the tank? Right now all i have in there are 2 damsels while cyceling but i will be ading coral in the next few months and i wanted to make sure the conditions are right.