Water Leak
 

Lately I noticed that my water has been drastically decreasing. Then I realized that droplets of water hanging from the side of my tank. Below are some pictures of what it looks like:

there may be a crack try to find it and put duck tap over it so

It's on all sides of the tank though.

Its hard to tell from the picture but it looks like the drops are coming from the top rim of the tank? If so it might be a over filling issue or too much splashing issue from a filter, I cant think of any other reasons water would be accumulating on the top rim, maybe a filter leak?

i have the same problem in my favorite tank. looks like the same kinda leak you have. There seems to be a leak in the black rim area. Theres some stuff you can buy at your local LFS that will seal that stuff up. ive had this issue for a few years... without sealing it... i just dont fill the tank to the point where i get the leaking issue. If you dont fill it up to that point and yet it still leaks then perhaps the leak is elsewhere.