I got a fluval chi in a 5.5 gallon size. I set it up, added water and everything, and put the bio filter media from my established ten gallon community. I also put some food into it, just to add some ammonia so there is a need for that bacteria. I left on vacation the next day. As soon as I get back I will check the parameters to see if anything has increased or spiked. Did I seed the tank right? Also did I do the right thing by adding some food?