Here's what I did with my 125, hope it gives you some ideas. I originally planned on larger water features, but this was really the best option for PDF's. There are a few male endler's swimming around in the left side pool.
A good pitcher plant would probably be nepenthes bellii, the pitchers are small enough that you could get away with D. azureus or leucomelas. PDF's are way clumsier than you would think when it comes to getting around in the water, I put in a ton of java fern and anubias that come out of the water to give them stepping stones to get across or out. If I did it again, I'd have that right side pool in the middle instead, so they could climb out on either side. Last step is some black contact paper to cover the false bottom. Hope that helps!