Shada, these 2 x juvies are to young at this stage for a guaranteed sex determination to be known, however as a guide they were incubated at lower temp ranges, i.e. 26.5 degrees - incubating for females at the lower temps - but then its not 100% guaranteed that Castelnaui are Temperature Sex Determined either. Normally in passed experience I have found that if there is one in a clutch that eats more than the other then they tend to turn out to be female - however inrelation to this pair they both are very ravenous feeders - no feeding variation noted on these 2 x juvies.
Currently have a few more eggs with many being kept - so if it turns out that you have 2 x females or 2 x males then I reacon I can help you out ok when the sexes are known.
P.s. You dont seem to have activated your PM message facility with APS.
Cheers in advance.