OK, so I know I'm supposed to quarantine fish. However, I have a problem. After purchasing everything else I need (and my tank's almost ready), I only have enough money for a few fish and maybe one plant. Definitely not enough for a quarantine tank. Do I really need one for the first batch I add? Or can I get away with putting them in the main right away, since they'll be the only ones in there? I won't be adding any more for at least a month if not more.