I recently upgraded my 20g tank to a 55g tank. I moved all of my gravel, the old penguin 100 HOB, and all the deco to the new tank. The new 55g filter is a Eheim pro 4+ canister filter. All have been running for about 2 weeks now. My parameters have been 0,0,40 the whole time. Is my bacteria colony good? When can I remove the HOB safely?