I'm sorry if it sounded like I was trying to challenge your post, but I was offering more options(that are probably safer). Though it does sound like you are trying to say that geckos cannot over-dose on calcium, which they can.
From this link: http://www.forums.repashy.com/rhacodactylus-ciliatus-discussion/4110-question-about-calcium.html
"Too much calcium, even without too much D-3, becomes a binder for essential vitamins and nutrients. Vitamin A in particular. The calcium blocks the absorbtion of these vitamins. In many geckos, especially leopards, the vitamin A problem can be seen with too much calcium in the materialization of eye deformities.. one big eye or small eye... Too much calcium can nearly completely block the absorbtion of vitamin A, which has visible effects..... there could also be other non visible effects from it blocking vitamin A and other vitamins, like reduced hatch rates (which are also seen with too much calcium)

If you look at calcium powder, you can picture the "Got Milk" commercial. It is a powder that will absorb moisture out of the body, and if it coats the lining in the stomach with crust, the animal can't absorb anything. It also neutralizes digestive acids....

Have you ever heard of Tums? Look at the ingredients.. it is nearly pure calcium carbonate. A 500 mg (half a gram)tablet is strong enough to eliminate acid indegestion in a 150 pound human! so what do you think that eating a bowl of calcium that size (you said your gecko ate similar amount) will do? Lets say you have a 30 gram gecko eating a half a gram of calcium, or the same amount as a tums tablet.... hmmm So that means the gecko is eating about 1.5% its body weight in calcium.... So if you weigh 150 pounds, what do you think would happen if you ate 2.25 pounds of calcium in a sitting? LOL Do you think you would absorb your dinner? or even have room to eat it?
Most prescription drugs warn that if you eat calcium or other antacids that your body might not absorb the drug properly.... or anything for that matter.. ....." quoted from a post by Allen Repashy. I know he's not a vet, but I'm sure he knows quite a few and has years of experience.

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