Check to see that all lights and filters on the aquarium are plugged in and functioning correctly. Feed the fish daily. Only feed what can be consumed in the first two to five minutes. Any excess food will become debris in the tank and lead to illness or attribute to excess nitrite levels. You should check the water ph and temp weekly. Be sure not to clean the filter too thoroughly as it contains helpful bacteria that aids in stabilizing the chemical balance in the tank. During the monthly cleaning, scrape and remove all algae from the surface of the tank. If you find you are having a significant amount of algae, consider adding an algae eater to the tank. Most Invertebrates require a specialized diet. Check with the supplier before purchasing and be sure that you are willing to make the commitment to have food delivered if necessary. There are two different types of invertebrates, tropical and cold water. Make sure that the type you are buy is compatible with its other tank mates. There are acrylic repair kits available at specialty pet stores, your local hardware store and of course online. When purchasing an acrylic aquarium kit, there will be many different options to choose from, at many different price points. Aquarium kits can be purchased at places such as specialty aquatic pet stores, from huge retail chains, or again online. It is important to set up and run an aquarium before any fish are introduced into the environment. Wash the tank and any substrate and decorations thoroughly with water. Don't use any soap. Fill the tank with de-chlorinated water and attach filters and lighting. Allow the tank to cycle until the water is no longer cloudy and sufficient P. Their food source could easily be taken away by other tank mates. Seahorses prefer to swim vertically rather than horizontally, and should be placed in a tall tank. An octopus and a shark or a ray are other examples of fish that require special needs and would fall into the category of specialty aquarium.