Just for Calcium and Vitamin D3 i have used Reptocal and Flukers with great success. They are very similar, except in price, Flukers is cheaper.
125 Gallon Dirted/Fully Planted Community Tank
55 Gallon Amazon Tiger Barb Tank
29 Gallon CRS Shrimp Tank
20 Gallon Yellow Neo Tank
20 Gallon Half Moon Amazon Serpea Tank.
10 Gallon Blue Velvet Neo's
10 Gallon Betta/Cherry Neo Tank
10 Gallon Betta Tank
12G Rimless Club