At this time of this writing, a 10-gallon freshwater tank will set you back around $100 for everything you need to get started. On the other hand, saltwater aquariums can be quite expensive.

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The fish tank is made from a durable, shock-resistant glass and comes with LED lights, which are great for aquariums with plants, and a filter with five stages of filtration, according to the brand.

Some aquariums are meant to be used as saltwater tanks and others as freshwater tones. Making this choice should be your first step when thinking about buying a new 10-gallon aquarium.

He's not lying about that. Cunningham said he has about 100 aquariums in his house, which serves as the stock for his website. Several of those tanks house his own personal favorite fish.

"It all began in 1999 when I fell in love with the Frontosa Cichlid," Cunningham said, referencing a freshwater fish endemic to Lake Tanganyika in central Africa. From there, he was rapt. More in U.S.