Divide the mouth of the fish tank into several pieces, and then insert a chlorophytum (a common orchid, not flowering but green) in it. I left it to other flowers, many of which are poisonous and not good for fish. Chlorophytum is a good choice! Now find some small stones and put them in. It would be better if there was a river nearby. When it walks to the river like a coral reef, small fish can shuttle between stones from time to time. Really beautiful! If possible, make a short paper box under the fish tank and put some colored light bulbs in the box. If you open it at night, you will have a special mood!

In fact, there are many skills in raising fish, not the size of a fish tank! It's how you handle these things and make a fish tank look beautiful!

If you want an oxygen pump, you can increase the oxygen in the water. Fish will be happier and aquatic plants can be put in. Plants themselves have oxygen, which will be released when put into water. I suggest you buy some miscellaneous fish to keep the water clean, and you can keep 1 without changing the water.