Hey everyone! Im going to do my best so you will understand my writting, im frome Sweden so it might be hard to fully understand what im asking haha but i hope i can be as understanding as possible. It was a long time ago since i wrote here on tonmo but i been around for sure quick update so i have been in the saltwater hobby for around 6years now and not to long ago a took a break for about 1 year. I have read alot of information about keeping octopusses and cuttles for years and I feel that im ready. Now im eager to start again, but i want to begin my dream of owning my own cuttles! I got a empty 40 gallon cube formed tank standing here and ofcourse i have to cycle it and all that before even adding anything. But my biggest question im asking myself is what kind of filtration i should use? besides live rock and a protein skimmer ofcourse. my tank does not have a build in filter like some tanks have, when you buy them. I have tried to look for different filter methods but i cant really deciede what would be the best choice for the tank that i have. I know alot of people use a sump, some uses canister filter etc etc. Would love to hear from you guys and would gladly take your advice of expertise! Best regards David from Sweden!