根据短文内容，从短文后的七个选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。
How to Make a Glodfish Live for Decades
Believe it or not , a goldfish could live for 10—25 years ot longer if it’s given proper care .However , with normal care it usually lives for about 6 years . The Guinness Book of World Records mentions a goldfish named Tish that lived 43 years! ____小题1:__.
Purchase the largest possible tank you can . While using a 20 liter tank is better for the fish than any kind of a fish bowl , at least 40 liters is necessary for quality of life a single fish . Chinese a tank with large surface area to increase the amount of oxygen in contact with the surface of the water.
__小题2:      Be sure that any decorations you choose aren’t hollow (harmful bacteria can grow inside ) and that they don’t have sharp edges . Provide your fish with different areas in the tank , such as an open area ideal for swimming and a hiding area . If you feed them at the same time every day , they will soon be waiting for you at that time and grow used to your presence .
Add some equipment to increase oxygen into the water . __小题3:     You can also have the current from a “waterfall” type filter help agitate (搅动) the water ‘s surface .
Clean the tank at least once every two weeks , but more frequently is preferable due to the large amount of waste . __小题4:     
Feed the goldfish one to three times daily with food apecifically designed for goldfish . ___小题5: Give them only as much as they can eat in a few minutes , and clean any leftovers immediately.
A.Provide mental and physical stimulation (刺激) for the fish .
B.Be aware that goldfish will not eat below 50--55  °C (10--14°C).
C.Here’s how to help your commpanion survive into the “ golden years ”.
D.If you do need to catch your fish ,consider using a plastic container rather than a net .
E.A small air pump can be necessary .
F.How often you do this will depend on the size of you tank , the number of fish .
G.If you choose to feed them more often , then reduce the size of the meals so you don’t overfeed.