ok i've got a 75 gallon tank that's going to be SW fish tank with maybe one sea anenime in it. i was thinking about going with a Emporer 400 outside filter that i found online for $42.00. What kind of heater would be good and what about powerheads? i'm from a small town so there's not great selection, so if anyone knows a good cheap online store, please let me know. also do i need to start out with a skimmer? I need brands, brands brands. Thanks all