i'm pretty anal about my water so this may sound like alittle overkill.
on my 135 i run a 1-tetratec pf500, 1-cascade 300, 1-lifegaurd 300fsb run by a rio ph, a diy over flow and wetdry with a rio pump. 2 filters that are rated for a 100 gal tank one thats good for 300 gal and who knows what the wet/dry is good for but i'm sure it would be more than enough for the tank . and in the tank i have a 7" retic ray a 9" silver arro and a sivler doller.