My torquiose severums spawned a couple of weeks ago. The eggs successfully hatched. After a few days they were free swimming. I left them with their mom for several days. She was a good mom, always kept an eye on them etc... but then their numbers started to decrease. I moved them to another tank where they swim in the net basket and fed them with Hikari's First bites. Is this food approprate to them? I was told that hatched brine shrimp is too big for them. What would you recommend? They are only 3-4 mm long.