I have a quick thought about trout, or any fish that would die off.

Depending on who's swimming in your pond, seeing some dead fish around in the water may not be too appealing. Granted, it may only happen once during a season, if at all, but it could prevent some from ever wanting to swim if they've seen it.

Unless of course, you have friends like this:


I'd still try it though.

Excerpt from Robert Crais' "The Monkey's Raincoat:"
"She took another microscopic bite of her sandwich, then pushed it away. Maybe she absorbed nutrients from her surroundings."