Hi I'm new to fish in general, so please don't get upset if I say something inaccurate. I have been doing quite a bit of research on Betta fish and Oscar fish. I think it's best for me to get a Betta fish first because they are more for beginners, to 'test the waters' and see if I should get into fish owning. Is there anything I should know before getting a Betta. Is Aquabid a good site to buy them from vs the pet store? In a 5 gallon tank how many water changes a week would I need to do and how much water (with a filter). Thanks!