My tank seems to be the breeding grounds fro some really funky looking stuff. The first is what appears to be a green algae that is growing on the gravel and on the sides of the tank. I have been scrubbing it off the tank, but don't know what to do with the gravel. Will it hurt my fish? Also, I have added a little Algea Destroyer to see if that will help a but.

Also, there is some fuzzy white stuff growing in my filter htat looks suspiciously like mold. I am not sure what to do because it is growin gon the biofilter that I was told to never replace or clean, but I don't want my fish to get sick. So far she seems to be doing just fine, though. Any thoughts on what this might be, whether it is hramful or not, and how to get rid of it if it is harmful? I could really use some help on this one!