after upgrading from a 30gal tank to a 60gal tank yesterday i killed my tree cichlids. i spent a few hours reading up on how fix the mistakes i have made in the past. i was reading about filtration and i found alot of talk about canister filters. i have always used the filters that hang over the back(they are very loud and it is hard to get to sleep at night). what is the difference? which are better? should i switch up my filtration since my tank is empty? i am thinking that once i get my water conditoned to the proper specs i want the put only yellow lab cichlids in my 60gal. i like their bright yellow color. any feedback or links with info would be apreciated.