75 gallon tropheus filter size?

[Fish-guy]

I've got a 75 gallon with about 15 tropheus. Should I go with a fluval 406 , fx4 or fx6? I like to stick with the fluval brand as I'm happy with it over the years. Any input?

 

[HUKIT]

I'd roll with the FX-6. I run a FX5 on my 72g bow front and couldn't be happier.