Yeah, surfactants will kill your fish. A good test is to shake the bottle, and if any bubbles last more then one or two seconds then it's bad bad mojo.
I ended up getting mine at 14% pure from a Janitorial Warehouse store.
"The important thing is not to stop questioning. Curiosity has its own reason for existing" A. Einstein
"Life is either a daring adventure or nothing."
"We can do anything we want to if we stick to it long enough." Helen Keller