Hello everyone! I have a glass aquarium that is 9 years old and I want to know if it needs resealing. The tank is 60 gallons and is currently empty. The sillicone has started to let go a little bit in some of the corners but the air gap only reaches about 20% of the way across the width of the sillicone. I can get a bit of my finger underneath it, however it is extremely difficult to peel off. Should I reseal it or should I wait a couple of years? Also the glass is a bit dirty with algae etc. so I would like some advice on how to clean that as well. Thanks in advance!