What type of carpet is he?

[DennisM]

I'm not too sure anymore. I looked up IJ's, and you may be right. But I still wouldn't rule out darwins entirely.

agreed, the 2 ssp are very similar in basic appearance and can't be differentiated based on these photos. however, if OP is from the U.S., which I believe to be the case based on their membership in USARK, it is almost certainly IJ. harissoni has been well established in U.S. collections for over two decades. variegata was extremely rare for most of that time and is still somewhat uncommon, though available now. variegata caught the U.S. market's attention with the introduction of the albino. As with any new morph the price point was extreme when the the first few hit the market. Rather than buying pairs of variegata , most of those who got into the early stages of the albino project purchased a single animal and mated it to other ssp, primarily m.s.mcdowelli. unfortunately, an overwhelming percentage of albinos available here are not pure variegata. and of course, neither are the hets and PH. Pure variegata (albino,het or not) are available at a reasonable price point now, but most that have the albino gene are not pure. I'm going to make up a number now, if the OP is located in the U.S. I'd say there's a better than 99% chance this is harissoni based on the place of purchase. Reverse that made up odds if the OP is in Australia.