so I need another filter on my 65 gallon SA cichlid tank not for any filtration problems but as a backup and a source of surface aggitiation and oxygenation. I currently have a fluval 406 packed with biofoam, matrix, and purigen. chemical levels are perfect but I am not getting enough surface agitiation in my tank and I need it since its 24" tall. So I was looking at a few HOB filters to give me that added oxygenation. my first choice would be the seachem tidal 55 for the flow rate and the fact its a canister in HOB form, the second would be the marinland pengin with the 200 GPH flow rate, the third would be a aquaclear 55. I just want some feedback and want to know which I should get. I am leaning towards the seachem filter because of the built in oxygenation feature.