I had an Occi.
I called him GT as he had GT racing stripes on his head. The australian form I had doesn't live very long however and we only had 18 months with him.
GT was very easy to keep. I had been told horror stories about their keeping, how they foul the water with the amount of excrement they dump, the inking, the escaping.
He was kept in a four foot x 1 foot x 18 inch tank. We siliconed a rim around the tank and hinged plexiglass to it. This was then latched shut much like a snake tank. The filtration included a skimmer box recessed into the side of the tank (with the plexiglass lid formed over the top of it) which had a very fine grate siliconed into it, to stop GT going down the filter lines. The filtration system consisted of a 20litre sump bucket below the tank.
Our water flow was in excess of 1000 litres an hour and at no stage did we have an ammonia, nitrate/rite or toxic bloom. So we obviously got that right. He did not ever ink.
He did disappear down under the undergravel filter, which had been our first filtration system in that tank and never removed. After he got under it, it did get removed. :P
Tank furnishings were slim, as he had a habit of throwing things around in the middle of the night and the danger of a broken tank was very real. He had a teapot, a cup and an old bottle. He loved his teapot.
We dropped common fish, caught at the local marina in his tank constantly and the little local rock crabs were enjoyed too. It was fascinating to watch him hunt and eat. His entire overall body size was only about the size of a tennis ball, but he could stretch the complete length of the tank.
He became very tame and would sit in my hand happily when I was cleaning the tank or playing with him, however he hated my partner and would recoil from his hand. Possibly because my partner worked with metal and we think the metal dust on his hands would have set up a chemical reaction with the salt water, possibly uncomfortable for GT.
Anyway, GT was great fun. His tank was alongside my computer and we had a lot of interaction. I missed him dreadfully after he died and the tank was retired.
