Pufferpunk wrote:I can tell you right now, he's not gonna be able to ID that blurry pic.
I agree.
Cannot exclude that they are dyed, but don't think this is probable, especially since they are said to be so tiny.
Larvae of Diodon holocanthus are yellow with reddish dots and the smallest juveniles are between yellow and olive. Maybe in combination with tank lights this color can be seen. Would need a better pic to be sure.
Small D. hystrix are often blue (just as D. eydouxii - which with proper lights may also look like the pictures, in the last year apparently this species has occured in trade here and there) and D. nicthemerus has yellowish spines.
Here's a nice ID key for the genus, should be sufficient to determine the species with the fish in front of you or proper pictures.
http://diodon349.com/ss349/key.htm
Give a man a fish, and he'll eat for a day. Give a fish a man, and he'll eat for weeks.