Luckily, they are fairly easy to keep as well. Guppies are hardy fish that can adjust easily to minor fluctuations in water quality. However, don't allow these fluctuations to become common practice, as they do cause some stress to the fish. The water temperature in an aquarium for guppies should be kept between seventy two and eighty two degrees. The purpose of this is to allow the fish to become acclimated to the water temperature in the aquarium. Carefully add the fish into the aquarium using a net and a bucket. Don't pour the water from the bag into the aquarium. The water from the bag could throw off your perfectly regulated water, as well as introduce new bacteria to the aquarium. While catfish generally get along with most fish, they are a predator and will attack and feed on smaller fish. Catfish are also nocturnal, and should be fed later in the day or at night. You may have to adjust the feeding times depending on what your schedule is now and what other types of fish inhabit the tank. Caring for Bubble Coral in an Aquarium As more and more people set up saltwater aquariums, more are also adding coral to the d cor. As with any living thing, it is best to understand the creature and how to care for it properly before bringing it home. Coral is no different as it is a live animal that you will be adding to your tank. Some of the most common are Button Polyp, Yellow Polyp, Hairy Mushroom Coral and Bullseye Mushroom Coral. Make sure when adding your coral, it is attached to the live rock at the bottom of the tank. Wait another 2 weeks. Don't get frustrated... you're almost there! During the eighth week, you can add Aquacultured Coral such as Pumping Xenia, Starburst Polyps and Spaghetti Finger Leather Coral to name a few. Metal frames became obsolete and more people started to keep salt water fish and invertebrates. More recently glass tanks have become less frequently used due to the flexibility of acrylic. Literally flexibility! Acrylic aquariums are far more for forgiving than there glass counterparts. If a heavy object strikes a glass tank, it will almost certainly break.