My 100 pinheads is looking more like 75 pinheads. In the past week they have grown very slightly. I'm using a bed of dry oatmeal as my substrate and I have mixed feelings about this. I don't know if they eat the oatmeal or not. I have no idea and it's not going to be pretty when I clean it up because the color of the oatmeal closely matches the color of the pinheads. If they have food/water and they are just pinheads, why use a substrate at all? heck, I'd rater just put a black piece of paper on the bottom and glue that down so I can very clearly see them against the black surface. Now, when I get adults I'll move them into another tank I have setup with black soil so they can lay eggs.
Tomatoes = not a good idea. I dices up some tomatoes and have found that it kills them. It's too watery and they get stuck in the goo of the tomatoes.
Ground up Dog Food = Eh, they don't SEEM to eat it much. It just sits in a tiny pile in the corner.
Carrots = The best so far. They all crowd the carrot pieces. The cool thing is I can take out the carrot sticks, shake the pinheads off of it and soak it in water to re-expand the carrot sticks and use them over again. They also last a long time both in cricket tank and in the fridge. I bought those carrots about 3 weeks ago and they look the same. All I do is skin them, cut them into long, thin sticks and poof, done! I pull the sticks out every other day and soak them in water for 30 minutes until they look bloated again. (warm water works better). After doing this 2 times, they do appear to discolor and at that point, I just throw them out and put in new ones. This is cheap, easy, and so far I find it to be the best way to feed the pinheads.