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they will breed on their own, you shouldn't have a problem at all. Try looking for them at night (tank lights off) as that is when they are most visible.
LOL!!! make sure you feed them tho.. just drop a few flakes in there. The cycle may kill them though if ammonia gets to high.. just like any other living creature. As was said, when you turn the lights off.. they start climbing up the sides. I started with about 10 in my 55 gallon and now i have literally hundreds.