hi bros! My name is David & new to this forum, I hav a new Custom made tank size 31"L X 21"D X 24"H,intend to have only marine fish & corals / rocks.is it better to have canister type filter or sump filter as I have got an overflow channel from my tank to bottom of cabinet,(pls refer to photos)wat types of filter materials like bio-balls,ceramics ring or coral chips?pls advise and thks a lot for yor advises.