I know there are a lot of aquarium experts on here, so I'm sure many of you will have some great advice. I currently have a 38 gallon, tropical tank. I want to put some "normal" fish in there, like bluegills, LM bass, maybe a perch or crappie, all on the smallish side. I know crappie are kind of hard to keep, though. BUt how do I make this transition? Should I wait to catch these fish and put them in there when the water temperature better matches my aquarium? As far as feeding them, what kind of suggestions do you have? I have a gravel bottom, would that be ok? Any tips would be appreciate.