I am getting two new 5 gallon minibows for my two that got left in my office...as I posted previously one was little and beat up and the girl is HUGE...so I have them in a temporary crappy tank and I am getting them each a 5 Gallon..I have the nano filters, heaters ,etc. Should I use thier water and gravel ( they have only beeen in there for 2 weeks) or get new gravel and use aged water only?