Well, remember, you do not have head height with a CL, you get some loss due to 90 degree elbows but . So the snapper is something like 2,500 gph and the dart is like 3,600 gph. If you are only going to have 4 holes, then the snapper is enough for a soft coral or LPS tank but cutting it close for a SPS tank. If you are going to make the outputs restrict with loc-line flared nozzels then you might get away with it for an SPS tank. To give you an idea, I have my CL running around the rim (so it is hidden from view) with 5 outputs running from a Mag 18 and it is not enough for most SPS in most areas. So my advice is to go bigger so you can add more outputs later or restrict the flow from the begining to suit your needs.