They are very colorful and they can also be the center attraction of your aquarium. If you did your research about Discus Fish, then you know how expensive they can be. If you are planning to buy a Discus Fish as an additional fish in to your aquarium, here are some tips that you need to remember before you actually buy one. The 2 Things that you Should Concentrate on When Discus Fish Keeping When talking about the health of the discus fish, there are really only two main aspects where great concern should be focused on. These two will dictate highly whether your discus fish will be able to spawn or let alone be healthy and live a long life. It is highly recommended that as a discus fish owner, you need to use a reverse osmosis filtration unit inside the fish tank where you keep the discus fish. This is quite advantageous and will make it easier for you to maintain the quality of water but they are not really considered as a necessity. You have to remember that reverse osmosis filtration unit cost a lot of money. Some would disagree saying that there are others more beautiful but that is just a matter of opinion, an opinion that millions of aquarium owners have made by owning a discus fish today. This mesmerizing fish though comes with a hefty price tag. Some sellers have been found to be selling their discus fish in the northern region of 250 dollars. They need to have some space to roam around in the aquarium. Because of this fact, you have to keep one Discus Fish for every 10 gallons of water. Be sure to avoid overcrowding the aquarium, especially with this kind of fish. They will be stressed out and with high levels of stress, the more chances that your Discus Fish will get sick. Tips on How to Determine the Gender of your Discus Fish Its typical for any respectable aquarium owner to breed their fishes. This not only cut down on costs of purchasing new fishes, but they also pose a good challenge in growing an aquarium. So, many breeders tend to ask how they will be able to determine the gender of their discus fish.