i have a75 gall with a tetratec pf500 filter i have 1clowntrigger ,1 purcupine puffer,1bluedevil dams,1-3stripe dam,1 orang. tail dams, and just added 1val. puffer. all get along good . this tank is about 6 months setup. do i need a proteen scimmer. all advice will help!!!