yeap, should be sufficient. if u manage to incorporate a wet/dry filter would be better. half of the sump filter should be filled with bio-media like bio rings or coral chips. cheap alternative can use lava rock. can get in LFS if u search around.

put in 2 or 3 fresh water sting ray like motoro would be nice. i would luv to have a tank like this..but all should be either crosss back or super red. no silver or greeenie. but beware though, not all comm aro tank will turn out fine. depends on aro temparament also.