I use visio and oceanic both brands well constructed relative to their cost. The visio's construction is nice, but you will notice some small blemishes here and there on the frame(bracing), but I think thats all tanks. Even the best of tanks sometimes come with shabby siliconing, and blemishes, but like mentioned before you should have silicone in hand. If you doubt the tanks construction, and question the silicone just add another bead all the way around.