Paludarium Construction (Update - 1)

I did a quick leak test now that the silicone has dried for 24hrs and found a small leak from the pond section into the land section. The bottom seam held quite well but one of the sides had a pinhole leak. Time to bust the tube back out and give it another go! This is my first time doing this so I'm not sure why I thought it would work perfectly the first time. If anyone has good advice on how to get the best seal the first time, please let me know!