I also agree with Tom, 2 smaller heaters are best, just in case one gets stuck in the on position, in that way, your fish doesn't get cooked.
Sumps are my choice for any large cichlid though, in that way the heater is out of harms way, and out of view, along with all the other equipment.
A pair of 200W Aqueon ProHeaters will do the job. I like two heaters because if one goes bad there is still back up. Submerge them at 45 degree angles at each end of the tank. They are about 30 bucks a pice.
I bought 2 Aqueon pro 400W and they both failed within 6 mo. I don't care about the warranty if they won't last. Failure can mean dead fish.
Aqueon doesn't make a 400w version of their Pro series, yours must have been a different modelI bought 2 Aqueon pro 400W and they both failed within 6 mo. I don't care about the warranty if they won't last. Failure can mean dead fish.