Be careful not to accidentally pick up a piece of substrate or gravel while cleaning the inside of the tank. However, if you do happen to scratch an acrylic aquarium, all is not lost. The tank can be repaired, unlike glass. There are acrylic repair kits available at specialty pet stores, your local hardware store and of course online. Waiting to buy new fish can be one of the hardest things about fish keeping! You need to add fish gradually. Fish excrete ammonia. If you add too many fish at once to a new fish tank, the water will not be seasoned enough to dissipate it. As the water in your Goldfish tank ages, it builds up beneficial bacteria that turn harmful chemicals excreted by the fish into harmless ones. By avoiding the care and maintenance of a fish tank, not only will it lose the visual appeal, but your fish will be unhealthy and unhappy. By following a daily, weekly and monthly care program, you will maintain a beautiful, clean and healthy aquarium. Daily Cleaning Routine To maintain a clean aquarium, there are some daily tasks that must be done. Last on the list for keeping fish healthy, is to keep them happy. Try to recreate their natural environment. It is recommended to keep a variety of plants in the aquarium for guppies to seek refuge. There should be about one to two inches of substrate in the bottom of the tank. Colored rock or dead crushed coral make a nice addition to the aquarium, and may help to make the fish feel more at home. Test kits can be purchased online or at your local pet store. They same store will also carry any solutions necessary to adjust the P. H. There is not much wiggle room when it comes to these specific staring points. In order to avoid a costly mistake it is important to be patient, watch the tank closely, and make sure that you don't introduce any marine life until the tank is absolutely ready. After adding some snails or crabs, wait another 2 weeks before proceeding. Now at week 6, you will add your first pieces of coral. There are many types of coral used in saltwater coral aquariums. Some of the most common are Button Polyp, Yellow Polyp, Hairy Mushroom Coral and Bullseye Mushroom Coral.