I'm guessing your light is incandescent. I don't recommend them ever, and I bet others would also. Get a flourescent.
Also, is your tank cycled? I'm thinking your two fish died because they are feeders, but it may be too much ammonia/nitrite etc.
Well I wish you good luck with your RCS. They are super easy to keep and super easy to breed. And FUN! Of course there not as cool as they were when I first got them, but they are great nonetheless.
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