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eheim filters/CO2. sand substrate problems?

Hi all,
I purchased a 2217 - 1000LH old style canister filter in top condition to
use on a 4x2x2 = 120 gallon tank = 400L. This filter will turn the water
over 2 times an hour, a bit too little but I will probably add an internal
power filter for circulation/mechanical filtration.

My question is that I know people use Eheim filters successfuly for a CO2
reacter (ie CO2 is bubbled into the intake and dissolves within the
filtered water) so does this only work with the 'profesional' series or
does it work with the old ones - ie no air locks etc...

(OLD = green transparent cylinder with grey lid)

Also I will be getting some white beach sand for a 65 G african cichlid
tank. Does sand cause many problems? The ones I have noticed are/could be:

1)anaerobic substrate - even with frequent weekly cleaning?
2) particles are suspesnded in the water rather then being caught in proper
3) fish waste collects on the sands surface?

Looking forward to some answers.

Daniel Green.

bevgreen at cygnus_uwa.edu.au