survive

About a month ago my male oachita map turtle died. I feel really bad because after he died I checked params and nitrate was 140 ppm. I just got to draining down his tank today. I reach in to get some rocks out and I see a little black shape zip through the water. I dont know what it is or where...

I am going on vacation next week for 6 days, and am wondering if my benga fry will survive without food. They are more than a month old, and get fed twice a day. Sent from my iPhone using MonsterAquariaNetwork app