Too Much Sunlight
I have a small preformed goldfish pond (185 gals). It has been shaded by dogwood trees for about twenty years. The trees were removed this spring.
It now gets full sunlight for about 15 hours per day.
Are there any artificial floating covers for sale?
I know I'm going to have temperature and algae problems because the deepest part of pond is about 18 inches. What type of live floating plants would you suggest.
I have 14 goldfish that are 5-10 inches in length. They tend to eat most plants.
I have to agree with you that your Goldfish environment has changed significantly with the removal of the dogwood trees.
I suspect you are already seeing changes.
My immediate suggestion is to purchase some shade cloth from a garden center or hardware store rated at 50% shade. This will bring the sunlight down to a more reasonable level until you can find more natural solutions.
I wouldn't use a floating cover as used on swimming pools as they restrict the exchange of gases between the water and the atmosphere.
As you point out, Goldfish love to eat most floating plants. They tend to die off in winter and cause pollution problems, as well as introducing unwanted pests, I would suggest not using floating plants, except as a food source.
Water lilies are a good option. They can be grown in their own baskets and like full sunlight. Goldfish usually don't attack them either.
They do die back in winter, but they don't create as much debris as floating plants do.
With 14 fish in 185 gallons, you are near the maximum for a pond of this size. You don't mention a filter or aeration system, so if you haven't got one, I would suggest looking at something before the water temperatures start rising.
You can lose all you fish very quickly from a combination of green water and high temperature.