Tunze 6105 vs. 6125

[Itchy Trigger]

After both of my tank's circulation pumps died yesterday -- the Maxspect Gyre, which I've aways had problems with, decided it didn't want to restart after being cleaned, and the Sicce Voyager stopped, and after cleaning it comes on for about 1 second and just stops again (I cleaned the impeller and nothing seems like it should be causing the pump to stop) -- I'm unex in the market for a couple of new powerheads. Honestly I'll probably just toss the Gyre as it has always been a PITA. Maybe there's a way to fix the Sicce though.

In any case, the tank is 330g FOWLR, 6 ft. x 30" x 36". I would love to go the Vortech route, but there is no room on the sides of the tank for the outer part of the assembly (I have both of the current pumps mounted on the overflow box). So I'm thinking Tunze 6105 or 6125. I like to have a lot of circulation, but don't want to have my sand (large granule sand) get swirled up into an underwater tornado. So something that spreads the water out nicely and pushes a lot of water. For a FOWLR, should I still be shelling out for the 6105 and be able to control it? I know that two 6125's would produce enough flow but would the extra $$ be worth it in this case?

Thanks in advance for the input/suggestions!

 

[DLHDesign]

I've had trouble re-assembling my old Gyre (150); it seems more finicky in terms of getting everything just-so in order to keep the pump from stalling out. My "record" so far is three re-assemblies before I got it working again... :-\ (Note that the 250 I have doesn't have that problem... knocking on wood here.)

The nice part about the controllable 6125's is that you have an instant solution if it's kicking out top much flow and moving your sand about. With the 6105, you will not have as many possible solutions. I think they're both the same general flow pattern.