I am pretty sure we all at one point in time snuck up on your fish tank to see what they are doing when you are not about. Cause we all know as soon as they see us they think it's feeding time.
Well I did that tonight and found out the culprit behind the dwindling Nanolutae fry.
Yup the PTC is a true badass. He darts in chomps one or two down, then gone like in a flash. One of the parents always follows the darting PTC. At this point he flips a 180 and attacks the parent .... wish I had my phone with me to record those shenanigans.