I bought a 110 gallon that had a slow leak i know where the leak is and only leaking in that spot should I reseal the whole tank or just the one corner? Leak is near the top quarter thanks
the problem is silicone doesn't stick well to other cured silicone. if its high enough the pressure isn't nearly as much as it is at the bottom. you could always try it and test it somewhere where if it leaks it doesn't ruin anything. I myself would remove all the inside seals of silicone but leave the silicone that actually is between the panels. then reseal with a quality silicone.
Yeah, you need to scrape off all the silicone on the inside of the tank, you can't just do the one spot, it won't stick. For a tank of that size, I recommend using SCS1200 adhesive silicone.