Okay. I think the XP3 has 3 trays. What would be my best layout in the trays for the most effective bio filtration?
Do you think I can still use both for my filtration without needing to upgrade?
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The XP3 uses 19W, which is less than 1/3 the power used by the FX5. I'm having trouble finding the media tray specs for the XP3 but it looks like they're close to that of the FX5s. The FX5 does have a bunch of foam surrounding the media trays which gives it a much higher total filter volume, and it does filter at a higher rate.
You would probably be good for a long time with just the XP3. Put pillow stuffing in the bottom tray (the first tray) and something like Matrix, Biomax or Substrate Pro in the other two trays.(my preference is Matrix).
Your water parameters will tell you when it's time to add more.