I just set up my 55 gallon 2 days ago. I took my fluval 406 from my 75 gallon ( 75 had 2 Eheim 2217s and the fluval 406) with has a 9-10 Oscar and 8 inch Raphael catfish. I moved the fluval which has been up and running for almost 3 years and moved it to the 55 along with a peice of driftwood and some sand from the 75. I had filled the 55 the night before and added substrate. Yesterday I picked up a few rainbowfish and a small pair of rainbow cichlids. came home switched the fluval to the 55 and did a water change also have put a new c4 on the tank. Having crazy nitrite readings(2-5) and ammonia is around 1-2. I also have had nitrate readings around 5-10. Did I jump the gun on thinking the fluval had enough bacteria? Also any advice on wut to do now. All fish r acting fine as if nothing is wrong. Have done multiple water changes using prime