Unfortunately the pics don't display the condition of the fish too well. As far as I can tell the fish appears healthy, and is the alpha of the group. Over the past few days I've noticed her (we'll assume a she for the purpose of simplicity) girth increasing in the ventral region, and her base colour has changed ever so slightly to more copper tone. The top half of her hasn't changed much, she's just "fuller" in the belly region. My first thought is that she's just eating well being the alpha loach. I don't really suspect spawn, given that all but one of my Striata were purchased when really small, less than a year ago.
Here's some less than ideal pics for your perusal:





Any thoughts most welcomed

pH 6.8
ammonia - 0
nitrite - 0
nitrate - 5
dH & kH 3
Bi-weekly 25% water changes.