Well, you don't *have* to get bottom heads, but your drums will probably sound a lot better if you replace all the heads at the same time. After a while your heads stretch and don't resonate as well as they once did.
Most places say that you should replace your heads every 3-6 months. I'm a bit lazier (poorer) myself, and only replace anything if it breaks.
And again, you don't have to get the same as the top head. I don't think you'd need to use coated heads on the bottom.
Just make sure you tune your toms correctly.
HB58
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