Any Tips on Resealing a Tank?

i would definately get as much of the old silicone off. IME with car silicone, it does not seal well on top of old silicone.

i would start with thebottom like you said, carefully using a razor to get the old stuff off. then lay a thin bead down. the final step is to wet your finger and run it along the bead you just layed down, flattening it and sealing it.

i know it sounds like a lot of work, but you will be glad when your tank doesnt leak all over the floor

Remove ALL of the silicone from the inside of the tank leaving the panes of glass stuck together, then wash it out with white vinegar to remove any residue of the silicone. Let the tank dry out then reseal with 100% pure silicone, reseal the whole tank in one go.

Edit: i forgot to say to wait a week for the silicone to cure before water testing the tank.

andyjh said:

So I don't want to pull out the silicone "between" the panes. (I can feel some silicone where the angled "hex" panels meet. I just want to pull out the "surface" silicone behind the panes and reseal those. Do I have that right?

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Yes, leave the silicone between the panes of glass there.

Here's a link to a tank i resealed recently.

It's a lot of bother but I tape off the seams ~1/8-1/4 inch away, otherwise I'm apt to have messy lines. If you do, remove the masking tape after smoothing the silicone before it dries.

andyjh said:

I wish silicone dried a little slower.

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Lol, i'm going to reseal my 180g soon and was thinking the same thing.

Make sure to use food grade silicone or silicone marked for use with fish tanks