I actually ended up getting mine off of the buy and sell of another board in the States. It is brand new and also has the factory gate valve mod and it was $325US.
I am currently using a G3 on my 230 and am not unhappy with the performance but I think it is a bit too small as I do have a large bio load in this tank.
After watching what my BK400 is pulling out of my 190 that is currently cycling I am convinced that it is not pulling enough out.
Once I actually get the GX4 and get it hooked up I will post in the product reviews for anyone that is interested.
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