you can never have to much filtration ...ok well there is a point where you can strip your water clean , but what you are using is just fine . some say you should have up to 10x the turn over of the size of tank you have .... so if you have a 125 gal , then 1,200 GPH is what you would want to try for .... i can tell you i am running about 600 GPH on a 55 gal tank . and thats seems to be more than enough
Ken