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Finally decided to pull the trigger on the 210g! Looking for advice on filtration for my two 4in RES. Any suggestions would be great!

Also looking for ideas for an above tank turtle topper.

Wow, I'm very jealous

You'd want to get the FX6 for this, or a pair of FX4s.You won't find any commercial topper for a tank that size, so you are looking at something custom here. The topper they sell could be hacked to accommodate a larger tank, but might be a bit cramped for your RES.