Filtration schematic for my 500 lt planted aquarium

[pavlos]

Filtration Schematic for my 500 lt aquarium
Pump is Quiet life 2500 lt/h, lifeguard modules, 2 mechanical, 1 thermostat module (will be used for UV if needed). Water is split into 2 before entering DIY biological filter, low flow rate is required there, all can be removed for service purposes, filter will work only with automatic water changes if needed (part before input valves) or without parts of choice (pipe can be connected overcoming missing part). All parts are here now.
4 dosing pumps introduce ferts, one input CO2 before biological filter.
All comments are appreciated
www.bellybean.com/~pave/aquaria/plumbingeng.jpg
For a general view of my DIY 48Height X 30Diameter Biological filter (more info on construction later):
www.bellybean.com/~pave/aquaria/biofilter.jpg