I think I have the glass as clean as it is going to get. the muratic acid did the trick, dodgy stuff to work with!
there is only the faintest bit of water marks left and I believe with the tank full they will fairly disapear.
I been picking up bits of wood along our waterways and have come up with this thus far. the larger piece is about as thick as my wrist. I think(hope) this is looking like roots from different trees reaching for the bottom.
what cha all think?