Bubbles in silicone

[mvh pets]

hi!
i recently got a 30 gallon tank. While i was leak testing it, i noticed a leak, so i am now going to drain remove the current outer layer of silicone and re seal it from the inside. i did noticed the cause of the leak was a big bubble in the seam. can this cause issues in the future or will re sealing it with a thick layer of silicone.

[gardenman]

If the bubble is a void of silicone between the glass panels where they meet and you apply the new silicone properly, the void shouldn't cause trouble. I might extend the width of the new silicone a bit to give extra protection. I use blue painter's tape when applying fresh silicone to a seam and I'd widen it out an extra eighth to a quarter of an inch if I was worried about the void. More silicone makes more protection, assuming it's applied properly. With a sharp clean edge, like you get by using painter's tape, you don't really notice the silicone anyway, so a slightly wider strip of silicone won't meaningfully impact your viewing of the tank.