I am hoping they are. I mean Bert(ha) & Ernie are still alive and active and things seem good. I did a small 10% water change yesterday even tho the tests showed wasn't necessary. I forgot to "rinse" my filter media in the water I took out but will certainly remember to do so next time! I know the diatoms are a sign of a healthy tank, and at first they looked ok as just a light smattering.... now, however they are orangey brown, quite thick, starting to cover my glass and just all around concerning me. I am afraid that perhaps I don't have enough flow in my tank and I seriously cannot afford to buy another thing :( So, my plan is to give it two weeks (till my next pay) and see where it is then. Will post some pics later when I get home from work :)