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Message: [QUOTE="Stephen Noble, post: 526207, member: 10353"] Welcome [USER=21223]@Woland[/USER]! You have an interesting pond. If I understand, it is about 3-feet deep and roughly 6-feet in diameter and is completely constructed from concrete. Has the concrete been painted or coated with anything such as an epoxy coating? I ask this because fish can sometimes be difficult to keep in untreated concrete. However, if the concrete has been soaking for many years it might not be an issue. To answer your questions: Yes, it can be a nice home to native species especially frogs and turtles. A floating island in the middle will attract both. No, don't make the pond any shallower. You need the depth for a winter hard freeze. Any overwintering animals will need the depth and also some way to keep a hole in the ice for gas exchange. Aeration will help reduce algae. Personally, if it were my situation, I would build a decorative bog filter next to the pond and create a waterfall with the returning water. The bog will greatly help with algae and remove excess nutrients. Looking at your images, it appears the pond is at ground level with your yard. Possibly, runoff water is making its way into your pond and if so, that most likely could be contributing to your algae situation. A pond needs more than a couple times per year of TLC. Please let us posted with your plans. We are happy to help. [/QUOTE]