My experience has been that early on they're not all that interested in food. They might eat very small amounts but thats about it. I seems like it's not until the night time temps are about 50 degrees and above that they start to develop a good appetite. I wouldn't concern yourself to much yet.
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Vichris
"The object of life is not to be on the side of the majority but to escape finding oneself in the ranks of the insane"- Marcus Aurelius