Bro, I just bought the Premium Aquatics 1-2 glue to give it a try, and its really effective! A word of caution though... you need fast hands!
You must confirm the position you want before kneading the 2 parts together. Once they are mixed, it cures really fast. I wasted a thumb's size worth as I didn't expect it to harden so quickly. It holds the rocks pretty well, good adhesive strength. Doesn't leave any residue as claimed.
The only complaint that I have is the price for the amount of "dough". If the price can be lowered further, I'm sure this product will be a hot seller.