By andrea tomkins in Misc. I know what works for me. I know they work because if I drop the ball, I feel it. Of course, eating well and not going overboard with sugar, beer, and coffee, figures into that as well, but admittedly, that is harder to moderate.
However, glass as a material is brittle and has very little give before fracturing, though generally the sealant fails first. The very first modern aquarium made of glass was developed in the 19th century by Robert Warrington. These aquariums had the glass panels attached with metal frames and sealed with putty.
Metal-framed aquariums were still available until the mids, when the modern, silicone-sealed style replaced them. Acrylic aquariums first became available to the public in the s.
Laminated glass is sometimes used, which combines the advantages of both glass and acrylic. Once silicone sealant became strong enough to ensure a long-term water-tight seal, it eliminated the need for a structural frame.
In addition to lower cost, glass aquaria are more scratch resistant than acrylic. Although the price is one of the main considerations for aquarists when deciding which of these two types of aquaria to purchase, for very large tanks, the price difference tends to disappear.
Prior to the invention of UV stabilizationearly acrylic aquaria discolored over time with exposure to light; this is no longer the case. Acrylic is generally stronger than glass, weighs less, and provides a certain amount of temperature insulation.
In colder climates or environments, it is easier to achieve and maintain a tropical temperature and requires less capacity from an aquarium heater. However, this material is not transparent. Concrete must be coated with a waterproof layer to prevent the water from breaking down the concrete, as well as preventing contamination of the water by the concrete.
The benefits of using plywood include: A popular positioning choice for plywood aquaria is keeping them in a wall.
Here the use of plywood is hidden by sinking the aquarium inside the wall.
Putting insulation between the two helps with the insulation of a heated tank. These aquariums provide slow, circular water flow with a bare minimum of interior hardware to prevent the inhabitants from becoming injured by pumps or the tank itself.
Water moving into the tank gives a gentle flow that keeps the inhabitants suspended. Water leaves the tank through a screen which prevents animals from being drawn into the pump intake or overflow line. There are several types of kreisel tanks. In a true kreisel, a circular tank has a circular, submerged lid.
Pseudokreisels are "U" or semicircle shaped, usually without a lid. Using two downwelling inlets on both sides of the tank lets gravity create two gyres in the tank.
A single downwelling inlet may be used in the middle as well. The top of a stretch kreisel may be open or closed with a lid. There may also be screens about midway down the sides of the tank, or at the top on the sides. Some of the most popular biotopes are the freshwater habitats of the Amazon and Rio Negro rivers, the African rift lake environments of Lake Malawi and Lake Tanganyikaand saltwater coral reefs of Australiathe Red Seaand the Caribbean.
The fish, plants, substrate, rocks, wood, coral, and any other component of the display should completely match that of the local natural environment.
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It can be a challenge to recreate such environments, and most "true" biotopes will only have a few if not only one species of fish and invertebrates. Finally, an emerging concept for the home is that of a wall mounted aquarium,  some of which are displayed at the Living Art Marine Center.
Relatively large home aquaria resist rapid fluctuations of temperature and pHallowing for greater system stability. Unfiltered bowl-shaped aquaria are now widely regarded as unsuitable for most fish. Advanced alternatives are now available.This is a good, short introductory game, especially for diverse groups where participants don’t know each other.
It works for any size group, provided there’s enough space so people don’t bump into each other. Conversations about work just got interesting.
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