Egon;3961487; said:Na, it's most likely not a leveling issue. I think because the tank is so large the silicon is drying before your getting to smear the bead between the glass or the glass surface is not completely clean/dry. It sounds like you have a very very small leak. But it's a leak and must be fixed.
I've been in your shoes and I know what your going through. It sucks I know
So you have two options: You can try to find the area that's leaking. Like the lower left corner has the leak or what ever? Then drain the tank and make sure the area is dry. Your going to need a couple days to dry this with a fan. When you think all the water is out and the tank is very dry, push your finger into the silicon in the area that you think is leaking. If water squeezes out your going to have to remove the glue in that area. Put a fan on it and dry it out again. Re-apply the silicon in that area and check for leaks.
The best option sucks the most. Usually the best decision is the hardest to make!
Rip out all the old glue and start over. Make sure the gluing areas are clean and dry. I like using acetone from Home Depot. I'm sure glass cleaner would work too. You just have to make sure all the old glue is off and the area is dry, no oils or dirt so the glue bonds to the glass.
Okay I'm sure your sick of me by now, I'll shut up.
never sick of good advice.... you're great brother and i'm glad youre here.
