I have been researching this for quite awhile for the lake I live on a shallow at most 25 foot 14 acre lake.

1 - you have to have some type of plant life

2 - water fleas and or water daphnae live on the plants in the shade of the plant

3 - fry eat the daphnae

4 - bigger fish eat the fry

5 - water daphnae eat the algae which causes discoloration

6 - plants cause the silt to drop down

you can put all the fish you want into a pond and it wont mean a thing without plants

the plants also absorb the extra nitrogen from the fish poop
and
they block the sun and that keeps the algae down.

A great pond plant are impatients - mine are over 2 feet tall now - i put them right into the water

now sadly you have the grass carp which will eat the plants, so put the plants into a fenced in area in the pond or shoot the carp!

the plants also protect the pond from wind, which will also stir the bottom up.

Kill all the catfish - they also stir the bottom up

Kill all the carp - they also stir the bottom up

build small weirs for the creeks, to slow the water coming in

Their are also various creek plants as well to help slow the water down, once slowed down the particulates will drop out.

Pity for the guilty is treason to the innocent