shinglhed,

If you haven't been there a year yet and your fish arent suffering from the water clarity I would suggest..... Do nothing! Maybe your water temps got a little high, maybe in cleaning out your feeder pond you stirred up some stuff that's not settling easily. Has anything happened to the surrounding land that would explain the changes? New silt sediment inputs? If yes you need to work on the cause rather than the symptoms. As for the suggestions you've received I believe (Emphasize believe as this is personal opinion)

1 - I would avoid the clams, then can cause parasites and there are 100's of species so what guarantees are there you'll be getting something desirable.

2 - Gypsum & Alum may work but if it was clear previously and is not now I think this is a band aid, whatever caused the situation will return.

3 - Grass Carp would likely not do very well in trout pond temperatures.

4 - I personally would be very, very hesitant to apply chemicals to your trout pond. Trout are extremely sensitive to pollution. I understand the need to use these products under certain circumstances but again unless what caused the problem is found it's just another band aid.

Understand I'm no expert.... The only qualifications I can point to is the love of my trout pond & some hobby reading. The point I'm attempting to make is be patient and be certain you need to fix something, don't fix problems that aren't really problems because the side effects of your solution may be greater than the original problem.

My trout pond goes murky for a cuple weeks in the summer, even picks up a slight odor but a few days latter everything is fine and the bottom is visible a 8-9 feet, the fish don't seem to mind.

Hope everything clears up for you,

Chris H