If you are interested in setting up a goldfish tank, check out the information presented below. Set-Up Since healthy goldfish, depending on species, can get to be anywhere from six to eight inches long and longer, they require quite a bit of room to grow and flourish. For the smaller varieties, plan on providing at least 10-20 gallons of water per fish. For larger goldfish, 20-30 gallons of water for each fish is advisable. Purchase the largest tank your budget will allow.
Proper filtration is essential.
They are messy eaters and produce an enormous amount of waste. To be on the safe side, many goldfish keepers install two filtration systems in their tanks. This way, if one system fails, the water will be kept clean by the remaining filter until the broken one can be repaired. Using double filtration also ensures that the water is kept as clean as possible. The filtration system of choice by many goldfish keepers is the power filter.