I'll admit I used it. I bought 2 bottles and dumped it in. I had the 2 shrimp also so not sure if it really worked or not.
Get a net, put the shrimp in the net and put it in the tank. Let it sit and decay.
"When creating an aqua scape, strive for the beauty of imperfection, as its art and there is no wrong or right, it's left open for interpretation" James Findley