Apologies for rekindling but this is a bucket-list-fish & my importer's got a lead.
Is the husbandry recommendation a single, pair or half-dozen?
Did we get anywhere on max-size, as the front-to-back turnaround on the in-wall tank is only 18'
Food? benthic/buried creepers? Will take kibble?
Multiple seems best- I didn't notice any squabbling amongst the group of large ones at my LFS a couple years back; more often than not, multiple would lie next to one another and startling one would startle the others. My single specimen seemed to do well on its own, however.
Maximum size in aquaria is uncertain; they can reach 120cm+ (and turn a translucent greyish colour as they get bigger) but it likely takes multiple years- the large (~50cm?) specimen I had didn't grow an inch under the many months I kept it. Wouldn't be too worried if starting with a smaller specimen.
I think they'd be fine with f/t bloodworms, blackworms, earthworms, etc. That's what I fed mine, and no problems seemed to arise from that. Don't think they'd take dry prepared, but it'd be interesting to see if they will. No need to bury the food, as long as other tankmates don't snatch it away. Feeding in the middle of the night (~11pm-1am) seems to be best, as they're most active then. Younger juveniles may take food during the day, however. Smaller ones seem more active and responsive to stimuli.