One thing that surprises me after decades out of tropicals whilst being into marines is the size of tropicals.
As a kid l remember buying beautiful big multi colored thick lipped gouramis, these days the juveniles on offer are so small and bland that they’re hardly recognizable as the same species.
One fish that will always grow rapidly is the Tiger Barb, those l’ve always bought small and they turn into big stunners rapidly.
Pakistani Botia l bought small as a kid, they rapidly turned into big, fat, healthy adults. Same fish these days have hardly grown since tiny purchase size, and that’s from two reputable dealers.
I suppose what someone said earlier has a bearing, captive breeding with no wild stock thrown in to strengthen the genes…..