Silicone edges - help

[Tuffloud1]

I peeled back the wall trim surrounding my in-wall tank and noticed some chunks of silicone missing on the inside corner edges of silicone as well as bubbling in the silicone where the 2 lanes of glass meet.

I also noticed some coraline growing under the silicone in a few areas. When using a scraper, the scraper is able to slide slightly underneath the edge of silicone, not sure if that's normal.

I'm pretty sure the bubbles were there when it was brand new.

The tank is 5 years old now.

Replace the tank or keep running it? I have the opportunity to change it out because I have to move it.

 

[mcgyvr]

Likely not an issue at all..
I "think" what I see there is roughly 50% the main structural glass/glass joint and also the inner protective fillet silicone bead intended to just protect the main silicone seal..
Is that correct? and if so is that part where the sand is encroaching just the inner protective bead?
If so its totally file..

 

[Tuffloud1]

Likely not an issue at all..
I "think" what I see there is roughly 50% the main structural glass/glass joint and also the inner protective fillet silicone bead intended to just protect the main silicone seal..
Is that correct? and if so is that part where the sand is encroaching just the inner protective bead?
If so its totally file..

Here's another couple pictures for perspective.

 

[Tuffloud1]

Here is a shot further away from that corner with the bubble.

 

[billdogg]

I'm with mcgyvr on this. I wouldn't worry about it at all, especially if its at the back of the tank where you can't really see it. IME, the edges of the inside filet of silicone tend to get that way regardless, due to bumping into it with algae scrapers, etc

 

[Tuffloud1]

I'm with mcgyvr on this. I wouldn't worry about it at all, especially if its at the back of the tank where you can't really see it. IME, the edges of the inside filet of silicone tend to get that way regardless, due to bumping into it with algae scrapers, etc

I was more concerned about the bubbles in the first picture I posted. Is this pretty normal?