Would depend of filtration and planting. Bioload is like this:
Gouramis: 56 gallons (for both)
Mystery Snail: 5 gallons for both.
So call it 18 gallons of bioload left (If unplanted)
3 B. striata would take half of that. Pair of Cherry Barbs would take another 4 gallons. Leaving 5 gallons. 8 harlequins would fill that. 8 Lambchops would take up maybe 3 or 4 gallons of that.
In a well planted tank, after 6 months, the carrying capacity can be effectively doubled, too, so if the tank were heavily planted, 5 B. striata, One male and 2 female cherry barbs, and 10 Harlequins or up to 15 espis would be fine.
We could quibble at the margins, but that should be about right.
