An aquarium hood serves several purposes. Usually it provides a light  source; prevents fish from jumping out of the tank; and reduces  evaporation, noise, and the release of foul odors. Providing proper  lighting is not essential, but can enhance the coloration of fish. Too  much light can be as much of a problem as not enough light. Fluorescent  lights in hoods may emit more light than needed. If your fish appear  frightened in a well-lighted environment, try dampening the intensity by  placing construction paper under the light device. If your tank  receives adequate lighting from surrounding lights, a hood may not be  needed, and covering the tank with a piece of glass may be sufficient  and less expensive. Nevertheless, some type of cover should be used. 
The hood is build from 1/4" thick tempered particle board (masonite).  The hood is 48 3/4" long and fits over the top of a 48" long aquarium.  It is 10" wide and 2 1/2" tall. The hood is braced internally by two  crossing braces each of which has two parts - a top and bottom. The  braces also provide support for four T12 or T8 fluorescent tubes. Wiring  for the light is run behind removable covers at the rear of the hood  that also serve as part of the reflecting surface. All internal parts of  the hood are painted gloss white and the inside top and front slope of  the hood can be lined with aluminum or (if a grounded shield is not  required) with reflective Mylar. Ventilation is provided by holes at the  top of each end of the hood. 
The hood can hold up to four full length bulbs and the bulb connections  are all water proof (safe from splash but maybe not submersion). When  the hood is open, there is lots of room to clean the tank. Do not use  any metal because this will cause the death of any reef tank. Keep away  from metal screws, metal hoods, copper or anything metal that could  leach into the tank. 
For an attractive aquarium display and finished look All-Glass hoods  provide the quality craftsmanship and innovative design you are looking  for. Each is packed with useful design features like full length doors  and instant start lighting circuits, so your hood enhances the display  of your aquarium environment. 
Cats like fishes very much. If u have a cat or in nearby then it will be  quite difficult to keep the fishes in lonely place then there must be  something for that, so, a cat-proof aquarium hood, it's primary feature  being a wedge shaped hood with a smooth, diagonal incline on the top as  opposed to the normal flat design with rectangular light boxes. This  way, any cat attempting to jump atop the aquarium In would simply slide  off, with no places to cling onto. In this, let's call it a CPAH for  short, the lights and filter and/or air pump would be safely encased  inside this wedge. The openings for feeding would be doors directly  level with the shell, and perhaps you could purchase a model with an  optional auto-feeder (for you lazy fish enthusiasts). However, relying  solely on the wedge and gravity to protect your fish is probably not a  good idea (when you have a cat as crafty as mine, at least). So this  particular CPAH would also be equipped with pressure sensors that (when  pressure was applied to certain areas for several seconds) would set off  an alarming noise (perhaps loud dog barking, sirens, etc) to send any  offending cat running for cover. These things, I believe, would  eventually teach a cat that some things are best left alone (or at the  very least keep your cat from causing harm to your aquatic pets or even  to itself).
 
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