What Is This Growing In My Tank?

[deano89]

Hello everyone,


I have noticed a recent growth in my tank which I have been monitoring but now seems to be growing and spreading fast.


I have taken a couple of pics that I’ve uploaded to Dropbox


https://www.dropbox.com/sh/m61vzgsfurpv7bl/AABC...KAp9a?dl=0



Thank you in advance.