Why not both? If you have a nice big tank for a Dovii, you would have plenty of room underneath for both a sump, and a nice canister.
After all; you really can't have too much filtration! And with the sump, the heater and other breakables are out of harms way, biological filtration and the surface skimmer are great, and the cannister is great for the mechanical and chemical filtration.
I've got pair of young Dovii, 6" male and 4" female, who are getting along amazingly well, that I got when the were they were under 2" a couple of months ago, definitely one of my favorite fish species!
After all; you really can't have too much filtration! And with the sump, the heater and other breakables are out of harms way, biological filtration and the surface skimmer are great, and the cannister is great for the mechanical and chemical filtration.
I've got pair of young Dovii, 6" male and 4" female, who are getting along amazingly well, that I got when the were they were under 2" a couple of months ago, definitely one of my favorite fish species!