I have 19 Moba now with 15 more coming in around 5-6 weeks, and I have 12 sapphires which I'm growing out in my 180gal. The sapphires are about 3 inches but still not big enough to put in with the Moba which are 4"-4.5".ken31cay have your moba & sapphires arrived yet?
When the Moba first went in to my 750gal I also put in eight 3" Tinfoil Barbs to see if they could act as dithers. Within 3-4 days all that was left of them was about 2/3 of their front sections - the tails and rear third of bodies were bitten off by the Moba. Never saw that before with Moba that small so wasn't expecting it. Hence the reason I'm growing the sapphires bigger before putting them in the tank.