21 degrees is nice for about an hour without a wetsuit. I have never bothered to try them in my tank, I will get one next time I'm there and see how they go. As for reproducing I have no idea at all, you do find quite small ones there. It looks like I might have to spend some more time down there doing some research for you, it also sounds like a good excuse I can use to tell my wife...
heres what I call a Chiton
This picture of the same octopus when it was on the left side of the rock pool sitting out on the sand.
This is sitting at the enterance of it's den at the lower right of the pool.
These shells are a main source of food for these particular octopus, to give a a idea of the size of things in the picture, the shells are about 7 or 8 cm across. The webbing is about 1/3rd or a bit less of the length of the overall arm. haggs
heres what I call a Chiton
This picture of the same octopus when it was on the left side of the rock pool sitting out on the sand.
This is sitting at the enterance of it's den at the lower right of the pool.
These shells are a main source of food for these particular octopus, to give a a idea of the size of things in the picture, the shells are about 7 or 8 cm across. The webbing is about 1/3rd or a bit less of the length of the overall arm. haggs