I actually have my 2nd chamber filled with water, so I don't get the waterfall noise at all as is. I also run purigen and chemipure, same as you. However I have my purigen and chemipure in chamber 1, in chamber 2 I have lr rubble (about 2#s) chaeto and a submersible fuge light. On top of that my drip tray is unmodified and I just cut filter pad to fit in the drip tray area. Between chamber 1 and 2, I widened the channel to allow more water flow, and the ability to fill chamber 2 easier. In chamber 3, I have my heater and an upgraded return pump. What do you think?