Yes, those may all be compatible, but as stated, I'd suggest you do a lot of reading before trying to keep an Octopus. They are escape artists. They can fit through anything that is the size of their eyeball, or larger so your tank has to have a tight-fitting screen across it's top. Also, there is not enough known yet in the hobby about the different species of octopus, so regardless of what they tell you at the LFS or online, chances are your octopus will likely get too large to keep as most octopus do not stay small but they all start small. They are also very curious creatures. They will take apart your powerheads and rearrange your aquascaping so you really have to plan your tank carefully to suit their needs. That said, cephalopods are my favorite sea creatures and I think if you have done your research to ensure that you are prepared to properly keep one, you should. Assuming that you agree to post lots of pics :)