hello! just wandered onto this site to see if i could find some info. right now i have a 55g rectangle but looking at a 75g bowfront. african cichlids, 2 fluval 405's. my question is where is the optimal place to place my inlets and outlets. not too worried right now with the gravel that i am using, but i am going to use carib sea african cichlid mix substrate which is like sand, and don't want my filters to suck up the substrate. any help would be thankful.*c/p*