The glass has to be cleaned as it has some calcium deposit but I was looking online and found that with a mixture of baking soda and vinegar it comes out with some elbow grease.
straight vinegar will work MUCH better. Baking soda is a weak base, vinegar is a weak acid. when you mix them the baking soda neutralizes the acid in the vinegar.
I'm so glad its holding. I only mentioned the sealing issue because i moved a second hand 75 g. and apparently the stress of the move was enough to compromise the integrity of the silicone. I filled it and wen tot bed. when i woke up the next day there were 75 gallons of water on my floor.