Mushroom Splitting & Possible algae identification?

[scubasteve03]

1st pic is a mushroom never had one split on me but just wondering if mine is?
And the 2nd I moved about a month ago tested after with a 0 trates but they is something new growing not sure if its a algae or something else what do you think?
It don't look like bubble algae because of the white in it

 

[fort384]

Updated thread title. Please see this thread for more info. Thanks!