Wait have you been giving calcium with D3 at every feeding?
What I recommended is a multivitamin with vitamin A and D3. I would get the reptivite with D3 and use this two days a month say the 1st and the 15th then at all other feedings you have to use a calcium WITHOUT D3. So you will need to buy that as well if you do not have it.
Make sure the light fixture is a T5HO fixture not a T8. And you need the 5.0 T5 bulb for it.