CLR and a sponge will remove the stains in no time. Careful around the silicone and rinse well!
What is CLR?
Hey I'm glad that that de-rimming method worked out. You might consider repairing the silicone in the top corners to get stronger and better-looking seams.
This setup might end up similar to what I have in my 20, but yours will look better with that rimless tank.
Thx for the tip. I am planning on removing all the silicone down the sides and redoing them but I want to clean the tank up first. Whoever did the siliconing on this tank did a very messy job.