When housing sharks, care should be taken to ensure there is adequate space for swimming. Sharks by nature cruise the open waters. When visiting a public aquarium, notice sand sharks tend to be constantly moving, while some of the other fish just hang out in the tank. A good alternative for a sand shark in a home aquarium is the catfish shark. It is important not to overfeed the coral or your fish. Algae is a pest that will cause damage or even death of the coral. Keep the algae as controlled as possible by scheduled and routine cleaning of your aquarium. Bubble coral may also get flat worms. These worms are easily spotted and usually appear as circular spots on the coral's vesicles. 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. Algae eating fish will make a great addition. They will keep algae levels low and will not damage the live plants. Once the tank is established and the chemical levels are stable, it will stay that way, and you shouldn't need to test it if you do frequent water changes. When cleaning the tank, you will need remove of stir the gravel to remove sediment that could possibly change the chemical make up of the tank. Use caution when cleaning an acrylic tank and be sure that the cleaning supplies being used will not harm the tank in any way. Copper, iron and zinc are among the micro nutrients live plants will need to survive in the aquarium. Generally, the water and the fish in the tank will provide the nutrients and fertilizers needed for plant growth. It is rare that any supplements will need to be added. One important factor in having healthy plant life is your filtration system. Catfish are known to be somewhat goofy and comical, but this may depend on the species of catfish you have. Their behavior will vary, but as a whole, the catfish is an entertaining addition to an aquarium. There are group and schooling catfish that get along well with each other. There are also loners who always stay away from their neighbors.