Starting with a Water Garden
Water is a source of life. Throughout history, water has been a necessity, even a source of warfare. Water gardens of various kinds have a long history. From elaborate fountains with statuary to the simplest aquarium (yes, I include aquariums as a form of water garden despite the usual focus on the critters rather than the overall concept), water gardening is an ancient activity.
Currently, water gardening is considered a new trend for some reason. Water gardening can be done using waterfalls and streams, ponds, fountains, and containers of various kinds some of which are as simple as a small indoor fountain with a recycling pump. Water gardening doesn't require a pond or natural water source either. Many garden supply outlets can provide anything from the most basic setup to incredibly sophisticated water gardens consisting of waterfalls, pools and streams (with or without bridges).
Water gardening can get expensive if you decide on a big garden full of plants, rocks, fish, and lights. Next you need to consider how much space you have available for a water garden. Size also affects the amount of maintenance your water garden will require.
When you choose aquatic plants, don't forget that the plants should, at most, cover about half of the water. Algae can be a major difficulty in water gardening. Most frequently, the problem results from having too many nutrients in the water either from fish food or plant fertilizer. You can eliminate algae through reducing the nutrients that cause algal growth by cutting back on feeding and fertilizing, adding more plants, putting in a filter system, or replacing existing water with fresh water. Transducers developed to control algae will not harm humans, animals, fish or aquatic plants. If your garden lacks a natural continuous water supply, you have a situation much like an aquarium. You will need to monitor both water quality and water level. Keep in mind that in many locations, tap water contains chlorine and a large amount should not be directly added to water containing fish (and some plants). Closed systems will require added water as the surface water evaporates. A large water garden that relies on tap water and which contains fish and plants, should probably have small quantities of water added daily. For water gardens without circulating, aerated, or filtered water, maintaining water quality may be more difficult.