In this article, I am going to give you a list of the best saltwater fishes for 20-, 30-, and 50-gallon tanks. This is a very peaceful and easy-to-keep fish for beginners. They highlight bright red, ...

In sum, you’re looking at about 40 to 50 gallons for a pair of goldfish ... get what you pay for when it comes to fish tanks. A decent 20-gallon aquarium may cost a couple of hundred dollars.

I f you’re curious about keeping fish and considering buying a 20-gallon aquarium, you’ve come to the right place. It’s hard to know where to start when choosing fish, and tank size is just ...