I have been keeping ACFs for almost 30 years. I feed mine exclusively Repto-Min because it is well-balanced and has the calcium and proteins the frog needs. There is no need to use any calcium and vitamin supplements. My feeding schedule is 3 times a week. I agree that it is not a good idea to have gravel as a substrate. I don't use any substrate and have flower pots for hides. My zoo includes 2 pair Xenopus, 4 FBT, an Axolotl and a Colorado river toad. Albino ACFs do not get as large as the "wild type." My female "wild type" is huge! One neat thing about ACFs is that both males and females call to each other. I have made sound graphs of their calls. You will really enjoy having these frogs.