Small leak from bottom. Went to get Cane's for lunch and saw it when I came back. Nowhere else around the tank is showing any signs of water, so I'm certain it's the bottom. I think the walking on it without the pond liner early on and having to pull my shoes loose is what caused it.
Going to dry it out, apply the remaining 1.5 gallons to the bottom and 6 inches up the walls and 18" up the seams in each corner and put seam tape in. I'll use the pond liner to walk on this time. I think it's the divets that I repaired that are coming back to bite me; not the overall seal.