Hello. So I'm preparing for my first monster tank with a sump(other was a 240gal with 2 FX5). Tank is 300something. I'm going to have tropical fish in it, so I'll need to heat it. This may be a dumb question, but am I supposed to heat the water in the sump? Or in tank? I'm assuming both would work, but which is more effective for such a large tank? My 240 didn't need heating. I hate being a noob!