Hi I have a new 36 gallon tank with a penguin 200 filter with biowheel which is cycling. Tonight I just noticed this grayish stuff klinging to the bottom of the filter tube that sits in the tank water. Not sure if this is good bacteria starting to grow or something else. I didn't want to wipe it off of the bottom of the filter tube if it is something beneficial for the tank water. The tank has been set up and going since Sat and I added fish on Monday. The water is fine nice and clear I have artificial plants in the tank and some decorations. What could this gray stuff be have heard it could be algae but am not sure my other tanks don't have it. Please help if you can I don't see this stuff anywhere else but on the end of the filter tube. Thanks any help is appreciated. Platytetrafan:help:
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