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Context: We got a bigger aquarium a few months ago, and it came with a fx5 filter. Well, the thing leaked everywhere, and I didn't notice for 2–3 weeks. I need a new filter ASAP for the turtles.

I urgently need to get a new filter for the turtles, since I'm not sure it would be good for their health to be in a stagnant tank. And I really don't want to dock them, since it's risky (in my mind).

Aquarium details: I just need the pump/filter thing for a ~120-150 gallon tank. Two red-earred sliders live in the aquarium, with sand and big rocks as the substrate.

Request: I was looking at the Fx4 and the Fx6. I'm not sure what to get, I'm not sure what's important or what's best. Fx4 or Fx6??? Or something else??

I would definitely go with the FX6 for a tank that large. We run one for our 125 Gal with two turtles and do weekly 50% water changes and quarterly filter cleans. We had 3 Eheim 600 filters previously and while they worked, the maintenance was fairly high.