It is best to use more lighting than what is included with standard hoods. The one bulb that comes with a hood is not enough to promote healthy plant growth. When adding extra lighting, be sure to compensate that with a nutrient supplement to stimulate plant growth and at the same time reduce the chance of algae build up. Alternatively, a saltwater fish actually has to drink the salt water, because the body fluids are extracted through the skin by osmosis. The salt is then excreted in the form of highly concentrated urine. Freshwater fish are a good choice for an inexperienced aquarium owner because there is more wiggle room in the water specifications. They are the hardiest of reef species, and who wouldn't love to have Nemo swimming around in their living room? Monitor the marine life closely. Check the activity levels of the fish, and watch for stress. Stress is the most common cause of sickness in fish. Remember that these creatures may have come directly from the ocean, and it may take a while for them to get acclimated to their new home. Invertebrates should be fed more frequently in smaller amounts than fish. Try to feed only an amount that can be consumed in the first thirty to sixty seconds. When setting up an invertebrate tank remember to include live rock, because some invertebrates feed on the parasites that grow on the live rock. These tanks are large enough to accommodative a variety of fish, but still small enough to keep in tight spaces in the home or office. Your local retailer can assist you with specifics in purchasing, but here are some suggestions for the basics. Purchase an acrylic tank, because they are lighter in weight and easier to care for than glass aquariums. level should be kept between 7.0 and 8.2. As you can see these specifications are much more forgiving than those for certain tropical or marine fish. Guppies mature quickly and usually only grow to be about one and a half to two inches long. There small bodies and feathery fan like tails add a lot of interest to the tank.