i read somewhere that if there are undigested crickets in the excrement of my leopard geckos it's because they are not hot enough when digesting, we have a lamp that is 75 watts and an undertank heating pad, but the temperature rarely breaks 95 degrees, would we be better off getting a bigger bulb for our geckos or one of those heat coils? your advice is appreciated, thanks.

also, which would be better for night time heating, we have a darker bulb for night, but it only gets up to 78 degrees in the tank, is that okay?

Those temperatures are fine. You don't need to change your current setup. Make sure the Under Tank Heater is working properly and that you have a hide over its location.

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It could also be caused by rapidly eating too many crickets in a short period of time.

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Mike
"Never worry about numbers. Help one person at a time, and always start with the person nearest you." - Mother Teresa

Or the possibility of an internal parasite.

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Merlin,
What's Life Without A Little Magic!