I'd use a drip plate and standard "bioballs" just like in a SW
wet/dry filter. Maybe some aquaclear or fluval foam as a prefilter. You can also throw some powerhead adaptable spong filters in the sump to filter out wee particulates - or just use it as a fry tank and make sure they don't get sucked into the return pump!
Nice tank - I wish All Glass still made the 8x2x2 240, but an 8x3 tank is awesome! Keep it freshwater and represent!