Well, if you have not purchased it, then I would recommend the 5 gallon version, if you think your son will really be enthusiastic about keeping fish. Some of the species that can be kept in these small tanks are: glofish, neon tetras, von rio tetras, betta, white cloud minnows, danios, rasboras, and guppies. Basically, if you want to keep more than one fish, then you need to choose a variety that will not grow more than 1-2 inches in length. The 3 gallon can eventually house 2. The 5 gallon can house 3-4, depending on what species you choose. If you like the betta, that is all you will keep in the 3 gallon - just one betta. But in the 5 gallon, you could keep a betta with a mystery snail, otocinclus catfish or a couple of white cloud minnows, for example.
Your wife should change about 30% of the water weekly. The little pump in the back can be pulled out every month or two, or any time the flow rate slows down, taken apart, and cleaned. And the cartridge should replaced once a month, the foam rinsed.
Date published: 2016-11-23