Hey everyone, so today I luckily happened to glance at the silicone on my tank, which I bought used. Just to give you some context, this tank has been running in my house for about 3 years now and it’s definitely not in pristine condition, but I'm wondering if those dark spots are a serious cause for concern (maybe it's water getting in, or something else?). Since we're talking about a 55-gallon rimless tank, I'd really like to know how much of a risk I'm looking at here...
