I'm looking for a new skimmer for my 30 gallon tank. It's a toss up between Octopus and the Aqua C Remora. I want it to be quiet and visually appealing but still do a good job skimming the tank. How much do they stick out above the tank? Whats up with the "good foam"?? Currently running Fluval 205 canister filter and wondering if I still need this or is it causing more problems than its worth?