Question in regard to heating.

[Fish Boy]

I have a 75 gallon aquarium that is heated through a oase biomaster canister filter. I was also considering using two 150 watt heaters on each side of the aquarium instead. I am wanting to have it where the heaters wont constantly have to run. So the question is a heater that is ran by a canister filter more efficient or is having two heaters inside of the aquarium on opposite ends more efficient?

[Colu]

I personally think a heater at each end of the tank is betta keeps a more stable temperature and if one fails it give you more time to fix the problem

[StevesFishTanks]

You can use all three. But the heater in the filter is going to be the most efficient if you agree that all the water in the tank eventually moves through the filter.

[TheDukeAnumber1]

Depends on what you mean by efficient, are you looking for the most even heating in the tank or just the pure least amount of energy used?

[Tanked]

I would think that a heater on both ends would be a better idea.  "efficient" involves a lot of variables   It is more efficient to heat the water closest to it's final destination.  There is the added benefit of two heaters backing each other up, and the security of seeing those little glowing eyes from anywhere in the room telling you that the heaters are working.

[Fish Boy]

It would be for the least amount of energy used