I would suggest not using a glass tank, 18 gal rubbermaids are much easier to move and clean. They need a good deal of ventilation when they are grouped in large quantities, so I cut 2 holes on each side and hot glue aluminum screen on the outside. The more surface area they have to occupy, the higher the survival rate it seems, so stack a few egg crates or layer paper towel rolls atop each other. Water crystals do wonders for hydration, which helps keep them alive longer. I offer lots of watery veggies too, like squash. I put their food on small plastic lids with a short lip. Keeping everything clean is pretty easy and it helps the survival rate as well.
Want to breed them? They need to be kept at 80 degrees to breed at the very least, I've noticed. Offer a short sandwich tupperware with moist peat moss as an egg-laying container. I read somewhere that each female cricket lays between 80 and 200 eggs. Nothing like harnessing nature and saving some money. It helps if you put a piece of screen on top of the container to prevent the males from digging up/eating the eggs. It also helps if you put the egg laying container underneath a portion of their egg crate/paper towel rolls. The more crickets you keep, the more often you should switch the egg-laying container. Outside/garage is a great place to keep the crickets (it gets nice and warm here), but don't stick them on the ground. I lost more than a hundred crickets to ants, it was a brutal massacre.
Baby pinhead crickets are so small it is incredible. When they say pinheads, they mean it. You might have to keep checking on the container (again, I put them outside) to make sure it stays moist, and you might have to look hard to see the babies at first. If your soil dries fast, keep the tupperware lid on. If it gets too wet in the container (lots of condensation), adjust the lid so it's open a crack. If you keep the egg containers nice and warm, the eggs should hatch in about a week, although my most recent batch took a long time!
Well, I can't think of anything else at the moment. The crickets alone are easy, just give them space and keep them hydrated and clean. These are just the things I've experienced and some tips that I was given when I started breeding crickets. There are many ways to do it successfully.
