He already is a member of MFK. He makes all sorts of wild claims about them while trying to justify his insane prices for them. A lot of stuff he says is full of half-truths, or is just plain lies. He also claims his 'ORIGINAL' marbled crays are better and somehow more 'pure' than every other cloned marble cray out there.
My own research across the net says they usually reproduce around 1.5" - 2"+. The eggs are 2mm in diameter, not sure how many eggs a 1/2" cray could produce. 3 maybe? At 1/2", they're still molting every few days. Not sure they would willingly take 20+ days off to care for a couple eggs instead of bulking up for a couple more weeks and producing 30 or more of them.
I'd take everything that guy says with a grain of salt until you verify it through other sources.
Mine don't like cucumber. I got some HBH Crab & Lobster bites for their primary dietary staple, and they always have various veggies available as well. They love Anacharis and blood worms.