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Hi everyone, I have a 125 gallon tank with 2 RES and my API Filstar XP4 is just not keeping the water as clear as I want it to be, it also started making a little more noise than it used to. I want to add another canister filter to my tank to increase the filtration, which is the best to get? I found this one on Amazon, http://www.amazon.com/Penn-Plax-Cascade ... ter+filter
How good would this be? I like it because it is relatively cheaper compared to the others but how well does it perform? Thanks

on my 125 gallon i have a fx5 and a cascade 1000 and they work like a dream for me

Stay tuned and I'll have a review up on my recently purchased CFS700.

Before you go out and buy more filtration, have a look at this thread: viewtopic.php?f=9&t=30145#p288911

That link should have the optimal media configuration for a turtle setup. What are your ammonia / nitrite levels? <--THAT is how you size a filter. If your filter is keeping your tank cycled with 0/0 readings then you can try adding a bit of extra carbon or purigen to clear up the water. If your ammonia or nitrite is high, that's a good sign that your mechanical to biological ratio is off or not enough and a bigger filter is needed.

Bang for the buck the FX5 / FX6 is hard to beat for a turtle tank. I have both the FX5 and a XP4 and the FX5 runs circles around the XP4. IF you need to upgrade, you might consider the FX5/6 and selling the XP4 to offset some of the cost.

Cheers!