Josh, i really love the tank so far.... But!..... It is better to fix what is in question now then later.....
Duck tape does nasty things in high humidity environments. For one it will come out. Rather sooner then later. Vivariums with running water are unpredictable and anything can and will happen. If at least a little piece get stuck to a frog or chemicals are gonna get into water.... You will regret you didnt fix at a stage you are now.

Fix it, you can silicone that piece in.