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Your Cichlids DO NOT read the recommended tank filtration sizes provided by the manufacturer. So no, those little piggies will definitely eat a lot. And, esp. with African, Rift Lake Cichlids - they tend to run with a pretty high metabolism rate.
So yes, a Fluval FX4 should get the job done pretty nicely for your 55 gallon tank.
But.....
I am a huge fan of keeping technical, electric stuff out of the interior of my aquariums. Meaning? I REALLY don't like putting those submersible electric heaters down into my tanks. So, before you commit to anything quite yet.... I would recommend you look into in-line electric heating units. Or even, all-in-one canister systems (Eheim - $$$). Those will definitely, Deliver the Goods.
So yes, a Fluval FX4 should get the job done pretty nicely for your 55 gallon tank.
But.....
I am a huge fan of keeping technical, electric stuff out of the interior of my aquariums. Meaning? I REALLY don't like putting those submersible electric heaters down into my tanks. So, before you commit to anything quite yet.... I would recommend you look into in-line electric heating units. Or even, all-in-one canister systems (Eheim - $$$). Those will definitely, Deliver the Goods.