Would depend on what size the tank is. Lets say 29 gallon bio cube. It would kill corals for sure, likley any other invertebrates as well. It had a very high and toxic chemical make up regardless of how its made, its nothing more than a heavy poison, and this is what makes you trip. It basically would reak havok on any that feeds by filtering the water.
Now drop a tab in a FOWLR and that might call for a fun night. The fish might just trip!