I am sorry for the loss of your leachie and unfortunately there can be no way of knowing exactly why it died other than having a necropsy done soon after the animal dies
Even this sometimes does not give you the answer

I do agree that the meal replacement formula is an important part of any Rhacs diet

The Leachie and the Gargoyle diets have both been discontinued and the Crested Gecko Diet is now being used for all 3 of these Rhacs

There is much controversy over mixing baby food with the MRP
Some have fantastic results and no problems with doing so and others argue strongly that you are messing with the formula by adding baby food(non-citrus stage one fruit) to it

Leachies do require more protein than Cresteds do and are usually fed more insects than fed to Crested Geckos
As for heat-with a temp in the 70's during the day and in the 60's at night-there should be no need for a heat pad on the tank

Also lights are not needed on the tank as these are nocturnal animals but they are often used in planted enclosures with no ill effects to the animals

It is important not to let the temperatures get too hot for these animals and to provide adequate humidity in their enclosures

Again-I am sorry for the loss of your Leachie-they are wonderful creatures

my 2 Leachies
Thelma

Louise