In that case, its time for a new tank.^ thats where the problem lies, originally i thought it was the surface, then later realized its actually between the panes of glass and reaches down a little past the half way mark...
To make matters worse, when i press against the glass, i can see there is a bit of water trapped inside, and that it moves around quite a lot... There also seem to be other bubbles as well, and while not as bad, may not be worrh the risk in the long run...
