Since there are a number of members with soon to hatch eggs, I thought we could start a thread for some ideas on how to raise some of the embryos.
I don't know where my brain has been lately . But, I have been thinking of this problem of culturing babies.
A long time ago, I used to culture marine invertebrate embryos. In the lab, we had a water table (literally a table with edges and shallow flowing water). You could place petri dishes and culture dishes in the water table and keep the temperature stable. We would place the embryos in several petri dishes and then you could have several groups of embryos to use for experiments.
We used pipettes (or eye droppers) to transfer the young. I used to turn an eye dropper backwards (take the bulb off and put it on the narrow end) to suction the embryos to transfer them. This is useful if the water in the petri dish becomes contaminated, you just move the little one to a new dish with clean water.
By using the petri dishes, there was enough surface area for the water to become oxygenated and the water table kept the temperature constant.
So, some key points for raising embryos are constant temperature, and oxygen exchange. You do not need water movement, which can damage the young, you just need a large surface area for oxygen exchange.
As far as food requirements, it will depend on the species of octopus.
I found this link which may give you some ideas to try. http://www.garf.org/news3p2.html
I am sure I have forgotten some key points, but at least this gives you a place to start.